Haven't had the mealy/mushy issue. Maybe because when I sous vide it's meat that's been vacuum sealed and frozen. My bigger concern is a few times meat was almost too firm like it had been pickled. Not sure if being frozen makes a difference, but never tried sous vide with fresh meat, because that seems weird.
Have done a few pork roasts 24-36 hours and they turned out perfect for non-smoker pulled pork. Was pull apart but not at all mushy or disintegrated. Last London broil I did for the dog turned out weirdly dry.
Like the instant pot I find sous vide a bit less revolutionary than people make it out to be, but still handy. Mostly for longer cooks instead of using the crock pot or
Have wanted to try to sous vide steaks that then get put into the fridge and seered to heat later, as that would be pretty handy for quick meals or group meals. Heard it works well, but I dunno.