As far as I can discern the schedulers have forgotten about weekend service altogether. It's been years since I've seen major service improvements to weekend service outside of say the 2018 and 2019 route reviews. When it's cutting time? The recent cuts made for say 30-40 minute weekday frequencies on routes that still see 18-20 minute service in weekends.
Examples include:
1- 30 minutes weekdays, 25 minutes weekends
8- 35 minutes midday weekdays, 25 midday weekends
14- 45 minutes weekdays, 30 minutes weekends
37- 30-36 minutes weekdays, 18-30 minutes weekends
301-18 daytime 40 evening weekdays, 21 all day weekends
I understand that the goal was probably not to downgrade weekend service anymore than the September 2019 and May 2020 cuts but, as shown above, people tend to start noticing stuff like this.