I’m not reading all of this thread just puking my input based on thread title:
TDM potions are op as fuck and all of the best builds run both, if your build can’t run either it’s garbage
TDM on furry forms is OP and more importantly makes many MANY builds “optimal” to run furry for TDM instead of a 2ndary class that makes thematic sense, this sucks. Throw the TDM on the skills or something please 
Berserker in general is OP, onslaught is busted, onslaught stacks are busted and should probably be toned to 10% TDM per IMO (If not more)
Weapon swap for extra shred on some classes is really strong, I wrote a fairly long piece of feeback on discord. I’ll copy paste it here:
" okay so here’s a passing thought: With the weapon swap tech I’ve recently been using Occultist, Inquisistor, Shaman, and Berserker get a huge boost to dps. Thermites despawn when you swap weapons, so do wind devils. Other classes don’t have a debuff (usually) they can cast for extra CC shred using a weapon swap removing debuffs on weapon swap would be the way to “balance” this but then also; why do we even have weapon swap in the first place? Does anyone really use it other than HC players panic swapping to double shields and a pillow fort to hide in?
#LetWindDevilsandThermiteMinesSnapshot
#andotherstufftoo
some specific cases have other things available, buuuuut those 3 routinely get 20-30% extra shred on their damage type off a weapon swap. In many cases this swap lasts 12 seconds and lets you allocate skill points elsewhere because you can do silly things like I am with the shield on my mystic build. I cap Bonechilling with my weapon swap set so I can drop points in my normal set for more damage.
This all being said; I think most players are too lazy to do this and in most cases it doesn’t actually matter. It takes more time to swap and cast then just smack mobs on “good” builds. The only time it actually matters is big bosses, nems, celestials. There are also many specific cases where weapon swap breaks other skills (like blood of dreeg) dropping your buff which at the wrong time can get you killed, easily.
(You can ask xervous how many times I’ve killed myself in crucible swapping weapons when I don’t mean to)
soldier can technically benefit, but I haven’t bothered to try
demo can’t, at least not that I’m aware of
nightblade itself can’t usually but is so often paired with things that can that it’s moot.
necro can but I haven’t played much necro anything since release
oathkeeper can’t afaik but a lot of oathkeeper sets have + shred and end up fine
arcanist can’t afaik, again tho it’s often paired with a class that can, You only need 1 pairing that can benefit from weapon swap and you’re fine
Sorc and Paladin probably have it worst overall. Specific builds may vary."
when I think of more it’s more than likely going into discord.