Brake conundrum

The reason it's not advised to bleed the brakes on a power brake system with the engine running is because the activated boosted can act like a "shock absorber" to the brake pedal and not allow it to get its full stroke, thereby leaving air in the system.
Man, Rusty, are You Showing Off...... AGAIN? LOL!!!!!!!
Love the Knowledge all Y'all Share! Thank YOU ALL!!!!!!!