Actually this blueprint hunting stuff adds to the variety of the game and is a great idea in itself.
It's just the current state of general things which makes it a poor feature, forcing you into a terribad 23/6 grindfest, and I go so far to blame the depart and lack of most crafters on this crappy BP concept.
Starting from the inevitable vexation of making an additional, well-built alt just to make the BP hunting worth your while and not prematurely ragequit due to frustration, over to unpickable lockers to the actual (horrendous) low success rate.
Also the immense vertical distribution amongst the different BP type rarities makes it a rather unpleasent feature. Don't have to tell how I was fed up with those moments when I found a BP during some hours of finding&grinding, rejoicing for a tiny second before my cheer was crushed after it turned out to be another useless FN Fail, shitpack or another BAWS manufacturing plan.
Some Items are not craftable at all. I miss BA's and MKII ca's badly, and the lack of easy obtainable improved flamers/MKII fuel (they are regarded as 'rare' now, are you kidding me) drives me nuts when it comes to leveling BGers. And speaking of which, why do obviously craftable items, available to everyone regardless of profession/specialisation, have their own BPs ? I have enough crap to decorate my base and its shelves, dafuq I need a freaking super sledge BP? Seriously, even a brahmin hide bp or that shitty suggestion which would enable you to 'craft' alts would be a better joke.
That all is not even the worst. Imagine you accomplished the unreachable task of finding all available BPs , effectively rendering your BP hunter useless. What are you going to do with that alt afterwards ? Running aimlessly around in wasteland, pking newbs and hoping for that rare instance where you find a lonely car ? If those lockers would sometimes spawn rare or hard obtainable items, weapons like bozars or some ammo like tiny amounts of 2mm EC heck even decorational items would do the trick, I would mourn considerably less after all that wasted time I've put up leveling those one-purpose alt.
If all those points would be taken into account while redesigning this whole BP/trunk hunter matter, It had the potentialto become an awesome and fun addition to the game.
In its current state, tho, it is complete garbage enjoyable solely by enthusiasts or nolifers.