One key reason for difference in Mon-Fri and Saturday timetables is that the former are normally build round school times while the latter can ignore them. That is unavoidable in a rural county where it is absolutely essentially for buses to service secondary schools. The 68 previously didn't serve schools, there were plenty of calls for it to do so, it does now, but it is thus now also impossible to run an even 2-hourly frequency.
Even in other areas, there are ways to have consistency. There's very few examples of such different Saturday timetables, to this level. I've seen some Saturday & School Hol timetables but this is a new level. 5 of the 7 trips each way run differently to the Monday-Friday timetable. Diversion for a school, slightly longer journey time for traffic both make sense. It doesn't make any sense though to revamp the timetable just for a Saturday. The first and last round trip are the same Monday-Saturday but the other 5 trips in between are different. Just run the School Holiday timetable on Saturdays, that is what almost everyone else does. In addition to this, on this new 68 timetable, Monmouthshire are now paying for a tender to directly duplicate over a commercial route (Phil Anslow 83), sure there are rules around this?
MCC is effectively an operator of last resort. It had picked up routes here and there (or even individual trips on the Monmouth town routes) when there were no other operators, or tender bids were unaffordable. This time round bids were invited for all routes, and (with the help of the Welsh Government's Bus Network Fund) there was sufficient funding to contract for (nearly*) all routes.
And sadly MCC awarded it to the company who would provide the worst possible experience for customers in terms of timetables. You've now lost branded buses as well (Phil Anslow branded buses for the 63/69 and the Monmouthshire Council minibus branded for the 65). What a great recipe for encouraging people onto the bus network. Sure Monmouthshire haven't sat back and gone 'We are happy with this outcome'. One or two passengers may be happy with timetables but it does nothing to encourage more people onto the network or encourage existing users to travel more.
By the way, the City timetables don't vary that much between M-F and Sat except for the 16A/C where the frequency is halved on Saturdays for some reason. There are the usual early morning and peak extras M-F, of course. Also some journeys to/from random stops near schools which used to dead runs for schools services.
1, 13, 16/16A 26A/26C, 27 all half frequency, 6/7 run quite differently between 7-9am and 2-4pm (not a school day/holiday variation), 20/21 some trips quite different. 31A/31C, 65 completely different, X30 runs 10 mins earlier on Saturdays than the Mon-Fri, 37 half frequency and some trips. 40/41 half frequency and none of the times match Mon-Fri. 42/43 buses run 4 minutes earlier on Saturdays! 60 is on half frequency into Newport, only 2 of the 7 departures match Mon-Fri. 73 has a random diversion off to Mathern. 74A/74C quite a few differences which make no sense.
Not sure how that is 'don't vary that much'.
Oh, and I'm pretty sure they only have one scheduler!
It was meant as a bit of a tongue in cheek comment because of how different they are, it is as if they were written completely separately.