Yep, that's the liability of squaring up: you can be pushed back, neutralizing your punching power because you don't have time to punch before getting pushed back.
The advantage is more torque and power on your hooks and uppercuts when you get inside...
Holyfeild was very masterful in how he took advantage of that.

It's not how Buster defeated Tyson at all.

I always think of Buster getting off first with long-range right-hand leads...
Very dangerous to throw right-hand leads, but it worked for Buster on Tyson, and it worked for Ali on Foreman...