Indeed, however back in the winter, there were many running on just 1 or zero toilets daily. Personally, I've not worked a train with less than 5 working toilets (10 car) for around 5 weeks, so from a staff point of view it is massively improved and we feel like we have been listened to regarding it.
Could always be better, unfortunately the physical restraints are not going to be overcome in the short term. There are plans to change the type of waste collection systems installed but this isn't likely to be sorted in the short term.
If there are no alternative units to swap with, or control haven't been given the right information by guards, or given enough time to sort out a swap then units will remain in service. Otherwise trains get cancelled which is seen as far worse than having no toilets, especially northbound where half the passengers get off at MKC or Rugby.