I’d say the level of waste from filament switching is a disaster. But many people are used to it which I find crazy.

It can be multiple times the weight of the actual thing you’re printing. Exactly how bad depends on the model. Here’s an extreme version:

https://www.reddit.com/r/BambuLab/comments/1jluvde/35_g_mode...

It makes one of those little color blobs every single time it changes colors.

Waste is waste, if you end up using 2 to 4 times the filament (depending on the number of colour change) it's still something to account for.

This might seems like a lot but this is the reality of the system.

Well depends on what a problem for you is. But the purging on complex models can be more plastic then the model itself needs.

And it also takes time. The difference can be a few hours vs a day of print time. Plenty of videos online that show case examples.