The best gear should ONLY be craftable.
Saying that 'the game is over' as soon as you craft it... isn't that the same as saying that the game is over as soon as you find it?
What's the difference?
People who'll stop playing when they have the best stuff will stop playing when they have the best stuff. Regardless of whether they found it or crafted it.
On the other hand, crafting a top-tier daedric sword requires getting the ingots, the daedra heart, and having a maxed smiting skill with perk-points in daedric crafting.
Finding one just requires killing a couple of high-level daedra and looting until you get lucky.
I'd rather have 'getting the absolute best weapon' be the results of my effort to gather all the required materials, level up and learn the right skills to make what I want, rather than the bland anticlimax of finding it in a box somewhere, usually while i'm looking for something else.
Aren't you just more satisfied when your primary weapon is something that you made yourself, from your own hard work?
That said, the difference between craftable (Blue) and lootable (Purple) is fairly minor. One extra mod slot and a little damage. Not a gambreaker
The main issue currently is that... as said before, getting parts to build a weapon is harder than just finding the weapon.
The solutions listed above would probably fix it pretty nicely. Raising the drop-rate for trash-tier steel tools or weapons. (broken or not. brown tools are only useful for scrapping anyway) or just making the parts themselves drop more.
It's not necessary with guns, imo, since you can already make high-tier guns with the parts from their low-tier variants. (SMGs use Pistol Parts, not SMG parts) so you have a decent stack of those, even if you also use them for turrets.
Not with tools though. Iron tools can't be used to make steel tools.
TLDR: I truly do believe that getting the best possible item should be a culmination of player level-ups, skill-investment and resource gathering, rather than the result of a random roll on the loot-table, but being able to make blue quality is fine, so long as the parts used to make them aren't rarer than the items themselves.
I understand that you don't want players to be able to get Q6 gear too easily, but we already need schematics for forges, schematics for steel tools/armour/weapon, a crucible, a bunch of forged steel and a bunch of other miscellaneous resources like ducttape and mechanical parts.
Oh, and enough skillpoints to get whatever crafting skill we intend to use to the max, which usually means getting the associated stat to the max too.
That's not an easy feat at all. All that stuff is so gated off that it's pretty much endgame content already.
I'd found a pair of Q6 handguns and a half a set of Q6 steel armour long before I had max ranks in either of those skills, and a gunned for them pretty hard, right from the start.
Granted, I didn't want pistols, I wanted an AK, but eh. I found a bunch of those too, but they were all trash.
Still, made myself a Q5 m60, so that's pretty sweet.