Loot progression is way too fast, faster than player progression. In most of cases it's not even worth to invest into some perks just to build something because you get such items lvl 6 from loot earlier.
When we got on our server (private, 4 people playing) steel tools and perks to use them (especially Sexual Tyranosaurus), we already started to drop lvl 5 and 6 from loot. Workbench found in book before I, person dedicated to engineering, got skills for it. I've stopped upgrading grease monkey on lvl 3 (motorcycles), so we don't have 4x4, but yesterday we've made 3 x Gyro. Heavy armor perks? Yeah, I've made them only to remove penalty, because I already have Iron Armor lvl 5/6 from loot. Auto shotgun, didn't even had perks for this, got one lvl 3 from loot. Then we've found schematics, so I've made perks to build lvl 5's and use it better, but we don't have parts for it. Meanwhile I've found another lvl 5. I think I will start getting sixes before we find parts.
We even wiped server and started over to nerf everything a little. I also didn't make Lucky Looter on purpose, but still got that bad taste in my mouth.
I really don't mind changes and game evolution every Alpha, but A20 in matter of loottable is broken. Loot gives you everything you need for gamestage you are in. There is no need to struggle, to invest into anything just to be able to build it. One of mods said on this forum that changes are made because of care bears, because they complained about hardcore style of the game and nothing important to be found. It may work for newbies but core gameplay doesn't make sense now.
I also read that Quests are meta now. I thought about it and I must agree with that opinion. You can loot almost everything and get those missing "because you are unlucky" items from traders.
Only solution to make game harder now is to make XP boost at level lower than 100%, because everything depend on it. You won't have a feeling that you've unlocked half of game content on day 7. The problem are levels 40+ when it takes ages to level up.