Citation needed there as well?
Guess it varies from person to person. Good to find what works for you.
The difference tends to be whether you're a "hard typer" or not. Folks who are hard typers (I am one), do much better with mechanical keyboards because it subtlety teaches you not to bottom out due to tactile feedback, while low-travel keyboards you /always/ bottom out while using. Folks who are not hard typers don't bottom out hard enough for it to injure them, and because they type more softly experience more strain due to the higher actuation weights of mechanical key switches.
RSI is fun like that, there's no one true answer. You have to find what works for you. It's not a mistake though that one of the first and most respected ergonomic keyboards has always been mechanical, though [1].
That said, /most/ RSI issues actually start with how you sit while typing. If you get a proper chair and desk and adjust your typing stance (yes, this is a thing), you can reduce wrist pain from RSI even without changing anything about your keyboard. Also, using touchscreens and using mice are way worse than the keyboard for you anyway.
The reason I responded the way I did to the parent, is that people who are hard typers are basically guaranteed to end up with RSI at some point in their life simply due to the strain of being a hard typer. As near as I can gather at this point, there's nothing you can do to train yourself to not be a hard typer. I'll be this way my entire life, but I can get tools that reduce its negative impacts.
[1]: https://kinesis-ergo.com/keyboards/advantage2-keyboard/
I don't use clicky switches though, I don't think they are good.
It feels like people use them for the satisfying audio and tactile feedback rather than any genuine improvement in typing speed.
This is easily remedied by using a very lightweight switch. Many different mechanical switches are available from well under 45gf to actuation force. (Thinkpad and macbook laptop/desktop keyboard range from 60 to 65gf of actuation[1]) You can see a small set of available switches and their force actuation curves here: switches.mx. You should possibly look into getting a switch tester with many types of switches to get the exact feedback force you prefer.
There’s a ton more websites (theremingoat.com) and public github databases for this data.
[1]: https://www.reddit.com/r/MechanicalKeyboards/wiki/ripometer
Citation Needed.
Mechanical keyboards are generally considered to be /better/ for your ergonomic health than low-travel keyboards. Part of this is that the primary form of repetitive injury is bottoming out the keys, which if you are on a higher travel keyboard with good tactile feedback you tend not to do, because you can actuate the keys without bottoming out.