It’s classic mistake - forget you don’t currently have the L-R bus selected and accidentally mess up another bus thinking you’re adjusting the main mix.
The suggestion is to have an option to flash any active mix select LED except the L-R.
MixPad recognises the risk and adds colour to the fader bank to remind you.
I agree that flashing indicators would be a benefit. Sometimes, I just don’t notice the steady blue buttons out at sea on the panel surface. I know I should pay more attention but flashing indicators have shown “danger” for many years.
I for one don’t always have the LR main mix fader on my current layer. In those cases, there isn’t a great indication as to which buss I am mixing to (a tiny box on the corner of a screen is hardly noticable). Something flashing would at least warn me that I’m not mixing to LR.