rpgs get easier when you character gets all the imba power and abilities... no surprises there...
my pure mage had very little threatning encounters when he was lvl 50+ with 100 in his core skills and he didnt have smithing or alchemy... just enchanting (and I didnt even use then o mana cost exploit either)
my warrior was almost unkilable aswell and he only had smithing...
Im not sure how you have a lvl 50 charcter that is a warrior/thief AND had 2 crafting skills perked and at 100 tho... but ye... having smithing and enchanting means you have the best gear available... add to that some imba damage pots and some poisons and you have the typical exploit.
Whatever happened to games that only a certain select few gamers could actually finish? .
having these forums into account, there are many people who dont play master difficulty without exploiting.. so yeah this is one of those games

I love trolls, assuming I stacked enchants into the stratosphere and made the legendary god-axe of head cleaving... Sorry, but no, vanilla level 100 Smithing, and I haven't put the same damage % modifiers on 4 different pieces of equipment either. Every enchant on every piece of equipment is different from another. I also play on Master or Expert, depends on what mood I'm in.
I think the problem is that there is no "Uber dungeon" for high-level characters. Enemies stop scaling completely once you hit level 50. Currently, the only thing's that really give me any sort of pause are extremely high-level Mages, Drauger Death Overloards (whatever the strongest ever version is), Dragon priests sometimes, and Ancient Dragons...
Dissapointing part is that I have the strange feeling that Alduin will be very anti-climactic for me (havnet progressed far into the MQ out of choice). Since Ancient dragons have similar stats to him, but I kill those by myself... Where as the Alduin fight you have NPC buddies with you.
reading this post, I get the impression that you, like many posters do so aswell, consider this some sort of "MMO" type of game that requires end game content... it doesnt... single player rpgs means the game ends when you reach the progressive path and story lines end...
no there is no "high level dungeons"... you decide wich dungeons you do when/at wich level, if they are level sacaled that is... acides from that, there are no specific "imba high level character content" no.