Comment by ActorNightly

Because cost. Same reason why dash clusters and infotainment systems are now all monitors - its actually way cheaper to use those than analog gauges. The software is built on a famous bullshit paradigm of "never rewrite, always reuse", and as a result shit gets patched together without any concern of how everything cooperates.

Now with hybrid or electrical drives, a motor controller is basically a package that runs its own software, which then interfaces with the rest of the car. And OTA updates can overwrite its firmware.

The only manufacturer that has avoided most issues is Toyota, since they have been doing hybrids for quite some time. Other companies are just starting on this path and to catch up, they can't be bothered to do software deep dives and figure shit out.