Indeed, some recipes do have a very low drop chance but none of them are absolutely 100% necessary to progress in the game. Not everything should be easy to obtain. Those that are lucky or persistent enough to get them have the benefit of being able to craft items that other players might want to buy from them. It's not intended to be challenging - it's a way to prevent the recipe being common place. If it was supposed to be common place it would be on a vendor.

Not sure I get what you mean about realising they are junk once you do get them. We have an item database (nsDB) that provides information on what every item in the game gives you stat wise. It's quite clear what each recipe or item provides and if you feel it's junk, simply don't bother farming for it.

I also don't see a need to remove any items. People use low level armor and weapons to reforge their gear, to extract into gems for enhancements, or to send to alts or sell to newbies to mention a few things. Unless you are thinking of something specific then let me know the items you are referring to - but I can't really think of what you might be talking about.

im mostly referring to gears that once your character outgrows they can no longer use ..for instance idq gears from years back took a long time to farm and get but now that we are level 100 the gear is pointless and for those of us who allstated the gears they can be hard to let go of.. but you cant trade or sell them... so they are just pointless... ive deleted so many gears full allstat 30 that i can no longer use and cannot trade or sell they are pointless...and now with the latest dmp, and catacombs gear the wonderland and von sets are pointless and untradable.
what i mean by after you get them you realize they are junk is that you spend a year farming to get gear and spend lots of money on cards to stat them then by the time you have them they are obsolete...i never got a chance to complete my dmp set but it is pointless to even try to finish it now with catacombs set out..why waste time farming and carding dmp set when it has such a low drop rate and is already obsolete and untradable or sellable...im basically stuck with 2 or 3 peices of dmp set leveled up and statd that are useless... and by the time it takes me to complete it i can already have a good start on the catacombs set.
if the gears were not so damn tedious and time consuming to obtain it wouldnt be such an issue...but they are..the payoff isnt worth the price.
all of the bf gear below lvl 100 is obsolete now nobody goes bf below lvl 100 anymore..and the amount of time it takes to farm those gears is ridiculous compared to their stats...and they arent tradable or sellable like the other stuff i mentioned earlier.. its pointless to get them.. i used a lvl85 bf gear set as a reforge schematic for some other lvl 100 gear because it is untradable unsellable or untransferable to your own acount...it took me 2 years of farming and much money on stats to complete that set and it became a big set of paper weight that i basically just deleted.
some of of the top gear from years ago for lvl 85 more recently lvl 100 are still untradable and kind of pointless to obtain for newbies cause there are better stuff out there once you hit 100... idk just so many pointless stuffs...if we could sell the stuff we worked hard for it might now be so bad... but everytime i have to delete a lvl 85 or 100 set full of allstats that is no longer valid that took years to obtain and i could really use on another character this game dies a little more inside me each time.

and about the recipe drop rate it IS important to the progression of the game if you need that recipe to level your assistant skill to move to higher level stuff...back when i played all day everyday i farmed certain recipes for almost a year tirelessly day in day out and never got them.. a couple of them i bought for more money than any gear in game costs...its madness... and yes without some of those recipes you cannot max your assistant skill or progress to a higher recipe/item that you want...so it isnt from a lack of time or effort to try getting them.. they just simply never drop for some ppl and its off putting for the game...a recipe should not sell for more moolah than donator gear in the shop..

every new player asks which set they should get while leveling up and i tell them the same thing none of the sets are usefull to try and get and waste time leveling or carding except toa gear till they get to 100 ..then get wonderland gear till you can get better 100 gear but dont stat or fret upgrading it too much... get donator accessories and weapon .. the rest is pointless and a waste of time to farm or get.. this is no lie.. and i have many characters i have leveled to 100 with in this manner in a few weeks. 80 percent of the stuff is pointless... now if i could sell or trade my outdated lvl 85 and 100 gears to noobs or my own lower level characters to help them level this would be great instead of just deleting it stats and all... and this is WHY there is so much stuff that is pointless and useless in the game..