most noticeable at high levels are some daedric armor parts with enchantments (I found them around lvl57).
you can also get enchanted ebony (and glass if you are into light armor) at early levels, more useful potions (including blacksmith and enchanter ones), and lots of enchanted rings and necklaces and also more materials.
I also found lots of daedric arrows, which is really good for my archery/one-haned/light armor/lockpicking/sneaking char
Is that the complete list? Im not impressed tbh. There are loads of enchanted ebony and glass in shops by lvl25+. And materials and potions are never absent anyway. Im not sure why you are listing these common items(some may call them junk) as unique, as it only proves how weak TH is. Especially
blacksmith and enchanter potions, which would imply they are actually being used. Where the only meaningful use of Treasure Hunter is if the character in question selflimits himself to not using it. You do realize that investing 5 perks info smithing instead, would get you all the full daedric gear ever desired? As soon as level 5. Btw, at early levels investing in lockpick is not wise either, at least not at higher difficulty levels. Where people reload on failed lockpicks(a myth really) a lockpicker will reload during frustrating fights, lockpicking doesnt help in fights. And running away isnt fun. Well maybe not on Novice.
So im not seeing any meaningful use here. Not for 5 perks. If you think otherwise, also fine. Its a singleplayer game, not some kind of a MMO, where choices matter.
There are several ways to carry more gear.
Well, these "ways" are more abusive in nature than any possible smithing any enchanting. Really, if even finding 500 daedric armors (which is not to say it is impossible to find for anyone else) loading them up on a bugged follower, then fast travelling on a bugged horse out of the middle of nowhere directly to the home base is "legit". Then, really, save yourself the trouble and just use the console. No need to imagine any kind of roleplaying or "evil" smithing or waste perks on lockpicking.