You’re right…assuming they have a spare or “extra”.If their work/livelihood does depend on a specific setup, then it would make even more sense to test the betas. Not on the production machine, but on an extra that can be used for testing and reporting bugs - and if needed restore a backup from the production machine if that dies.
If they depend on these machines for work, they should have an extra.
…but the term “starving artist” comes from somewhere. Perhaps the artists complaining about this so vociferously wouldn’t if they just had a spare—or the money to buy/maintain one—to tide them over.