EVs actually tend to use fewer ECU modules than IC vehicles - even Hybrids are driving a trend towards mechanical and electrical simplicity.

The IC manufacturers are fighting repairability tooth and nail, but the only ones who can afford their new shit are the last people who would embrace being locked-in to dealer repairs.

All that, and the dealerships/service-centers will always require mechanics, as the manufacturers themselves will always prefer to be able to fix and re-sell used cars.