Sad to see more people making excuses instead of rising to the occasion.
I promise you, you are perfectly able to complete these as tanks.
Frankly, the requirements so far are way too easy.
You can easily do them as a healer too if you actually practice maximizing your time.
I’m not sure where everyone is at with this patch but you should be aware that there are now items that will do millions upon millions of damage for any spec in the game, especially tanks.
My rank two echoing void is regularly my top damage and does more damage than healers in mythic plus alone.
These things are just not tightly tuned enough to be threatening quitting over.
Just go do it as tank. Use the new food for an even easier time.