your title does not reflect your main post
a universal weaponlist is good because it makes the introduction of any player from any scene a bit more easier and gives them the same freedom in each of those leagues.
if you're arguing based off of last pushes it might be harder to sac players in and new teams will suffer with it
alternatively this means you can capitalize more from double sacking since if there's a heavy and engy they take time to rotate off those classes and push. You can also run banners to help with pushes. Wrangler is banned, eviction notice was unbanned before and doesnt affect the game in any way, and you are an idiot if you use engi rolling out to mids or defending last with gunslinger. Giving demo more weapons lets the class have more freedom to change the style of the class which is a good thing. More styles mean more creative ways of play.
if your team has issues with stalemates as of this current patch look at stvs of high level players playing on sizzlingstats to see what you can do differently, because you as a random person with 0 experience complaining on the forums doesn't matter to anyone or help anyone out.