Breaking features that paying users overwhelmingly do not use is not a showstopper for most businesses. I don't actively hate power-users, but if you're savvy enough to do anything other than open up the browser in the default settings and make with the clicky-clicky, you're savvy enough to undo it when you run into problems.
See also: "I disabled Javascript and your website broke", "I disable first-party cookies by default and your website broke", "I couldn't get your website to work on my wife's computer which I set up to run Lynx on Ubuntu Dapper" (no, really), etc.
I feel a lot worse over the related answer for disabled users, since they typically don't have an option to turn off being disabled, but the economics are the same: 100% higher development costs to improve the experience of under 1% of users is not feasible.