Solvitieg

My biggest one is...

Requiring users to login with a username or customer id. (instead of email).

Depends entirely on the application.

If your application has many basic views, you'll be wasting time writing out CSS grid properties for a basic responsive layout.

I mean, at some point you'll recognize you're reinventing the wheel and just pull in a CSS grid from a framework.

This applies to basically any components that has been battle tested in Bootstrap.

I hold this opinion too but I struggle with the high cost of accidental and unwanted deletion.

To delete your account's content I think here should be email verification or 2FA.

How does this happen when you compile through Babel?

I don't know about "a lot of sites". Very few, I'd say.

Other web developers may want to chime in but I rarely have cross-browser problems between Firefox and Chrome. I can't recall the last one.

The only time I encounter a problem with Firefox is looking at people's codepens where they're using webkit only prefixes or a draft API.