Now, I had joined also from my tablet but samsung put the camera in the center when in landscape mode and got no such remarks and I was just smiling
I have an iPad Pro with A15, and it holds battery better than my M1 MacBook Air on video calls. They are both great though, much better than any x64 devices I have ever had.
It works perfectly fine. Only main difference is that, in landscape mode, instead of people seeing you look slightly down instead of into the camera (like laptops), people see you look slightly left instead of into the camera.
99% of people seeing your image in the call won't notice or care. Especially when things like your lighting setup make most of the difference that people do notice, which has nothing to do with the camera you're using.
I use my iPad for video calls (Zoom) all the freaking time and it's fine, but perhaps that's because i have it in the tall orientation so the camera aligns.
Being a bit off-center is the least of the problems with video calls.