simply seasoning and pan frying some extra/super firm tofu (like you do with chicken) with some peppers and onions, for fajitas, is an easy way to introduce yourself

More like an easy way to convince yourself tofu is terrible. It has its uses, but a direct replacement for meat is not one of them. It has almost no flavor, and if you don’t cook it just right, it has all the texture of undercooked scrambled eggs.