I agree with this. Do what's fun for you. It's a game. Also, while the tier lists may be mostly correct, that's all that they are, a list. They don't give a full breakdown of the many different team compositions that are possible with that character.
The list is there to give you a general idea of which fighters can hold their own and singlehandedly carry you through matches against the strongest teams in the game.
I can't recommend evolving all bronze/silvers into golds because of how significant the stat difference is, but I also won't say that you're wrong for doing so. Don't let the meta ruin your fun is all I'm trying to say.