You don't have to use it in manual. Plus the best way to learn about the exposure triangle is to use manual and experiment.My only concern with the 70D is that I'm coming from a bridge camera. I don't know anything about manu
Honestly I was thinking of going with the t6s instead of the 70D because it is more of an entry level cam. I'm coming from a bridge camera and don't have a ton of knowledge of photography, yet I still enjoy it and need a cam for filming YT. So for my first DSLR I would prefer it to be a bit more user friendly and a more entry level model would work better for me I think.
It's not that hard, and it's not like your burning through film.