Generally it doesn't hurt to simply cut the power. Log will show a warning about router being restarted without proper shutdown afterwards ...
You can cleanly shutdown the router, there are actions in both GUI and CLI.
My guess is that vast majority of RB owners don't bother switching them off regularly ... I'm not as I never know when my better half might suffer from slight insomnia ...
Generally I disagree with any MKX post, and then I reread it to make sure my first instinct was correct.
After suffering the ill effects of power outages for my Cap ACs, which required a net install to fix. Something about corrupted memory due to power cycling (tech support after viewing supout) convinced me of the fact that power bumps premeditated or not, may not be well handled by mikrotik units.
I think the suggestion to use the system power off route is proper.
I'd rather manage rats than software. Follow my advice at your own risk! (Sob & mkx forced me to write that!)