This is fine IMO if you get compensated. For example my old job I got double baseline pay for Sundays and holiday work. This was fair.

Nowadays working in software I sometimes do stuff on the weekend - but only because I know I can take longer breaks during the week since part of the work is already done.

“Good enough” is my goal and it should be generally. IMO Norway has the best working culture in that regard, although I only know if from the outside/stories.

Right it's not about moving holidays its about planning them for a reasonable time if you have strong seasonality to your job.

If your job is some giant e-commerce retailer and you probably shouldn't take Black Friday or the week before Christmas off. If you work in accounting or some operations role then quarter end is likely bad. If you work in tax, then late March thru April probably bad. Etc.

There's plenty of time in the year to take off around whatever your jobs regular busy season is. Don't set yourself up for failure.