I don't see how it's worse to do it on a phone than your laptop, or over the phone with a broker via a voice call?
Most folks I know who use RH just use it as a fun little side gamble/game. Small-ish amounts of money, something they could afford to lose, with the rest in more stable funds or investments.
I agree, both that that's my experience and that it's the right way to use RH. But then that means this isn't exactly an existential crisis; if you can't run your side gamble during some periods of high market volatility, does it really matter?
On one hand, now is a fun/important time to be messing with your side gamble. It'd be like if a betting site went down the day of the Super Bowl. If you're just using RH to gamble and day-trade, periods of high volatility are some of the most fun times to be actively trading!
On the other hand, I don't really care. I'll be fine. Most of the folks I know who use RH are just joking about it being down. It's annoying, but no one's broken up about it. A lot of the folks casting their anger at RH seem to be folks who already dislike it and probably don't use it?
Professional or large-scaled investors with large sums invested probably aren't using RH for a lot of reasons even before you get to the downtime issues.