I’m always surprised how often brake checking is mentioned on here. I honestly don’t think I ever encountered it.
There are times when people in different cars, with different brakes, different brake balance and different techniques will obviously have a different braking point to me.
If I am behind them it is something I have to be aware of, they can brake earlier, later, for longer or even mid corner if they wish. They are in front, that’s their choice.
Braking half way along a straight or on exiting a corner is not something I have seen.