Almost your entire list is feats Thrall pulled off in his first book and never seen again in-game.
- Thrall chose to leave Durnholde after escalating abuse by Blackmoore, working alongside Taretha to successfully engineer his escape.
- Thrall chose not to remain among the Warsong Clan after finding Grom initially, instead choosing to seek out any survivors among his own Frostwolf clan.
- He chose to embrace his legacy as a clan chieftain, as well as embracing the old ways of the Orcs and becoming the first new Shaman since the rise of Gul'dan.
- He challenged Orgrim Doomhammer to a form of Mak'gora after Orgrim insulted both Grom and Thrall as a test, disarming and defeating the current Warchief.
- He successfully used his intelligence and tactics to enact a plan of rousing his Orcish peers from torpor and leading them in serial revolts in the internment camps.
- He led a decisive attack on the last remaining interment facility of Durnholde Keep, finally killing his old nemesis Blackmoore and avenging the death of Taretha Foxton.
- He showed Tirion Fordring that the Orcs were not two-dimensional murderous creatures, further expanding Eitrigg's own example to the Human.
- His decisive actions on first arriving to Kalimdor secured him the aid of the Darkspear Trolls, followed by the Tauren led by Cairne.
- The Elements did not direct Thrall to step down as Warchief, rather he decided that the entirety of Azeroth was more important than just one nation. During the Cataclysm the Elements were too fearful and conflicted to really command much of anything.
- No one knew how to contend with Deathwing, including the other Aspects, until Nozdormu and Kalecgos struck upon an audacious plan.
- Thrall did not "abandon" the Doomhammer, it stopped working for him in the same it did Blackhand before, and he knew it was time to pass it on as it had been passed to him.
- Thrall was not exiled to Outland, but instead had long abdicated the seat of Warchief and retired from heroism within the Horde. Given his many losses and scars both physical and emotional this isn't really outside the pale of what could be expected.
Cherry-picking facts doesn't really make for a great argument either way do it.
Not really a fair comparison to someone stating Thrall's feats over many years in-game and over many different expansions.