Comment by noncoml

It's not only the lock-in, as the document says, its about limiting the downtime.

Sailboats have the similar issue:

When are are in the middle of the pacific and get an egine problem, you want the engine to be low tech enough to be able to fix, or at least patch, yourself with minimum parts.

Yanmar switched its whole lineup of engines to ECU around 2014, but the one without ECU are very much sought after for the above reason.