1. “as it was intended for Jurists to not be stained by corruption”
Well that’s not gone too well has it?
2. “If Federal Judiciary held lifetime seats, they would not feel the need to"repay" anyone or any party, and could make rulings based on their interpretation of the Constitution.”
But if they did feel the need and or had fallen short of #1, then they have a life time to enjoy their corruption.
3. Engage that UC Berkeley Constitutional Law thing of yours and explain precisely what in President Biden’s proposals warrants this assertion:
“Stripping the ability of the Judiciary from "checking" the excesses of the Legislative Branch would be the beginning of real totalitarianism in the US.”