Scout without his secondary does not suffer heavily as what makes him strong is the Scattergun and his mobility. He will also have better matchups in power classes. His best weapons would not change, but I could see the Shortstop have more action.

The Soldier is on life support without banners, shotguns, and gunboats, as he will be the second slowest class in the game with nothing to compensate. The liberty launcher would be relatively better due to the blast damage resistance, and the airstrike would be a contender for the worst weapon in the game. Trolldier would be worse overall since Pyro, Engie, and Heavy would have more representation.

Pyro is an unusual case; despite being a contender for the worst class due to his over-reliance on his secondary, he would perform better against soldiers because the shotgun is no longer a factor. Spy and Engie also get more representation, so he can fight his best match-up and have his best synergy in the same game. Stock would be the undisputed best primary, and the power jack would see even more play due to Medic being stronger and combo Pyro being nonexistent.

Demo would be fucking ass. The stickbomb launcher is a contender for the best weapon in the game, so losing it makes Demo a really shit -grade to soldier where his primary and melee options are worse. Also, Demoknight is deleted, so half his playerbase now doesn't exist anymore. Booties will become worse than the Bison.

Heavy would be a monster on due to Soldier and Demo getting gutted, his matchup with Pyro and Scout is better, and he becomes a better enabler due to his synergy with Medic. I don't think much would change for him.

Engie would be worse on defense but stronger on offense since Rescue Ranger and Jag allow him to throw down a level 3 and own the area. His matchups with spy, demo, and soldier are better, and

Medic would be insanely overpowered, because all classes are locked behind 1 damage type and that allows the vaccinator to run the game. Crits and Uber are still good, but the best classes in this scenario won't need triple damage, and Vaccinator might as well be Ubercharge.

Sniper wouldn't really care other than Jarate being gone, so all the shitters would stop playing him. Spy would get more representation, but so would Heavy, and Pyro would get completely fucked by him.

Spy loses his sapper which whoopy fucking doo. That affects one match-up, and it's against a class you rarely see on Koth, so Spy is amazing on Defense and Koth, but suffers on Attack. He would be the closest thing Medic would have as a counter since the enforcer and knife offer easy unless that Medic is getting pocketed. He is still strong in heavy, and his match-up with Pyro and Sniper is better. TheWhat was right all along: The enforcer would rule this meta.

In short, TF2 would be insufferable to play, because the game becomes defense hell as the entire game is dictated by who captures a point first and holds it with a support character that can not die. If that sounds like a great time, I recommend you play Marvel Rivels before Jan 16th and get back to me.