Until you posted this I had not noticed how many things are T6. I don't play operations much myself as I play Randoms / Clan Battles / Ranked mostly.
If you are sticking to mostly Operations, then yes you will definitely find that to be the case. If you are in Ranked and stuck in Bronze, then yes that will definitely be the case.
If you can make it up to Silver League Ranked you will find yourself in T8 and can pull out much beefier BB's like Alabama, Bismarck, Vladivostok, or heavy cruisers like Baltimore and Prinz Eugen. DD's finally get their concealment module and start dropping their conceal below 6.0km - and the mighty Akizuki can spam HE all day while Cossack/Lightning get mega-conceal.
I've said it before here in the forums so I'm not afraid to point it out - the Primary Game Mode is randoms. I understand that not everyone fancies randoms as their go-to way to play, but that is where you can find the most variety of gameplay and definitely not get stuck in T6.