...It would make it safer to use that way, but I just never liked Metamask wallet and I don't care much about ethereum and all it's tokens, but Rabby.io wallet is much better eth alternative for metamask.
...
The metamask mobile app is extremely laggy and basically unusable. The chrome web extension can be used normally. But when connecting to keystone, the QR code of keystone cannot be scanned. Maybe it's because I used a poor quality USB camera and replaced it with a laptop camera and it worked fine.