AFAIK, the internal rendering engine for Preview was replaced with something much, much faster, and in the course of the overhaul, linking the script to Preview was sort of inevitable.
But I don't know about it in detail. Ask @stax76.
BTW, the new approach isn't that complicated compared to direct script input.
You can use shortcuts to shorten the process:
F5(Preview) -> G -> (start frame number) -> Home, G -> (end frame number) -> End.
Repeat these steps for multiple cuts.
Unless your script is so complicated that rendering takes a lot of time, this may come in handy.
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