That would 100% been the right move. Some friends of mine with networking and ops backgrounds told me, "never trust an electrician to do low-voltage work right." After my experience with this one, I think I should have listened!
Absolutely. I've seen two examples of electricians using wire nuts to splice two runs if UTP wire together. There's also a general disregard for keeping the pairs twisted as close to the termination as possible.
My electrician ran CAT5e to the doorbell, flush cut all but two pairs and ran the 24VAC on the remaining two pairs to the doorbell! I replaced the wifi doorbell with a Reolink PoE one, turns out you can run PoE and fast ethernet on just two pairs, although it made for an interesting termination.