I think the major consensus about wallet cases are a few things:
- Too bulky on what are already bulky phones
- Inconvenient to check notifications
- A hassle to use the camera and can even get in the way of the shot
- With magsafe wallets it's become harder to justify
- They're very expensive
Probably more but you get the general idea. I think Nomad still makes them which is a good company overall.