I wouldn’t class it as “cost cutting” personally id rather class it as “bad management”. The bulk of movie world’s major rides are over 10 years old (excluding Rivals). Quite a number of these rides are difficult to get parts for (compared to dreamworld’s ride list where they got rid of all of those types of rides). So they will need more time to work on these rides - that’s just part and parcel of what happens when rides get old and more time needs to be spent caring for them.
From my view these woes are more of a victim of poor planning. Scooby’s renovation was as pointed out by many a snap decision and should have been foreseen much earlier (or done proactively) to take into account for lead times. That decision means one of the park’s biggest crowd draws will be down for between 2-3 years.
Likewise Arkham’s replacement has been too slow. The ride sat there for years with zero action while movie world came up with a thousand ideas on what would replace it. They should have known they had to replace this ride for a while, given what happened to Corkscrew, but it was again another spur of the moment thing. That replacement ride is now due to open 5 years after the ride it replaced closed.
Both of these things are managed properly and people wouldn’t be writing these reviews because rides are open. Was this done to save money? Probably, but that’s not the primary reason. Movie world management know these all have to be done eventually so why take the “she’ll be right mate” approach and take your sweet time with these things and make decisions on the spur of the moment rather than with some foresight.
Cost cutting to me means nothing gets built - so the Wonderland comparison is moot in that regard.