Validating an input field while it's still focused is like a teacher repeatedly interjecting "this is no complete sentence" before the students have finished their sentence.

I couldn't agree more!

I'm disappointed this rant didn't finish half

field being in focus doesn't mean I'm not done. field not being in focus doesn't mean I'm done.

focus alone is a very bad criterium

I hate when they don’t give instructions on how to format and leave you guessing

What is you want to send on pressing 'return/enter' young man. That big button.

Well yeah, gotta make sure that users are stressed as much as possible. Just add a slow and cpu intensive validation to make the input feel janky.

Then add confusing error messages and just for fun add an A/B test on the form that is broken half the time.

Bonus points if you "forget" to add any useful contact information to your website/app.

Just give the address of some remote island.

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