The whole point of this game is to grind tank lines, buy premium tanks, farm credits..get good equipment, good consumables, good crews so you can finance your t10 gameplay. But, as it stands right now, most people seem to agree t10 gameplay is the absolute worst.
The reasons for that are many but it honestly was not so bad when you had the 3-5-7 setup in the MM or even the older setup. All tier 10 is really bad cause all it does is make everyone play only the OP tanks if they wanna be competitive and just fire gold. Sprinkle the ocasional BS tanks that are worthless aside from putting 1k dmg into someone randomly or other gimmicks..and..well..it is pretty lame.
You could play the underdog tanks before and have more success since it wasn't so stacked with chieftains and everyone going hulldown. Now, i look at my tanks ..and after 7 years of this game i have almost all of them..and i am like..well, most of these suck now. So i just play tier 8s and 9s cause the balance is decent there. But what is the point ? isn't it all about t10 ? my 7 perk crews just going to waste, too..idk but i can't imagine everyone is happy with this.
Source: https://www.reddit.com/r/WorldofTanks/comments/ra827d/so_since_t10_gameplay_is_terrible_why_are_we/