Even if we accept that some unwelcome stuff was going to happen, I don't think it should be this
I accept that some 4tphs could become 3tphs during the day without causing too much harm. At a push I might even accept that the population of Inverclyde is substantially lower than at other times when it had the previous service level.
If we accept that some commuting is never coming back then it seems like we should be trying harder to get the people that will still be travelling to work (which would mean running trains for more hours of the day to suit people going to places like hospitals and call centres with anti-social hours). It also seems like if commuting is going to be less the thing then there should be more emphasis on weekends (yeah, I know...) and evenings.
But 4tph to 2tph seems like going too far. And if you're only going to run an hourly service within the built up area of a city, or if you're only going to run 4.5 trains a day from Ayr to Kilmarnock, then a more honest approach would seem to be to admit that you're giving up and just not waste anyone's time (and I'm certainly not recommending that!).
It gets really bad when it puts holes into commuter flows, for example stations south of Kilmarnock are left with viable commuter services to... well... I guess any offices that are within Central Station or Union Street. Certainly not the universities or anything like that. Glasgow - Maybole is also out unless you trust them to make connections more than I do.
There are some individual really particularly oddly unnecessarily daft things in the timetables (2.5 hourish gaps in services with trains passing through). With my cynical hat on I'm wondering if they've done some of these deliberately so they can say "we listened and we made changes..."
If I was trying to sell this proposal to people I'd be saying "look I know it's not ideal, but what it does do is make capacity for possible future services to places like Beith, Grangemouth, Bridge of Weir..."
The future for Reston station of course continues to look ever more elephant shaped and ever whiter.