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And let’s not forget ENG lenses. While the servos are technically housed outside in the lens grip, the grip is essentially permanently mounted in place and with regular service, the servos perform for years under extremely demanding and harsh conditions. My oldest, continuously used ENG lens is at least 15 years old and while it’s serviced regularly(used to be yearly) it’s only been in once for a servo specific problem.
And to take that one step further... let us not forgot that A LOT of cinema lenses, specially the lower priced ones , start as still lenses with motors in them that they just take the motors out of and put gears on with some new mechanicals. We did the same thing with our awesome little 18-50mm and 50-150mm back in the day. The mechanical part of making a still lens into a cinema lens isn't trivial.. its a lot of work, a lot of design and it is expensive to do... and requires one by one alignment with the manual focus marks for accuracy... which we really don't need anymore when the lenses are smart.