to give the original question a concrete answer: yes, low-touch for years is real and i know several who do it, but every one of them has a monitoring routine and a kill switch, and every one has had to retire or retune a system when its edge decayed. the automation removes the minute-to-minute clicking, not the responsibility. plan for maintenance and youll be fine, expect magic and youll be blindsided.
depends on the firm. some prop firms forbid running correlated copies across multiple of their accounts because it games their risk model, others are fine with distinct strategies. read the specific firms rules before splitting EAs across funded accounts, getting flagged for prohibited correlation can void payouts. on personal accounts youre only answerable to yourself.