as frugal as possible.

technically speaking, no one is irreplaceable. so to attain FIRE, should aim for high paying job, work hard in the younger years, save up and invest. 20 years down the road, should see a bright light at the end of the tunnel.

yup time is really our best friend, but subject to one's willingness in saving up and investing, rather than splurging on all kinds of luxuries stuff.

but the big caveat is also the ability to get a high paying job, so gotta work hard for it, it doesn't come free/easy for average joe like us.

Generally, people will want to live in a comfortable environment isn't it? Don't you want to make your own home a good livable condition to your liking?
So long they can afford their house renovation (not to the extend they will be heavily in debt) can already lah. how they wanna spend their money is your problem?

Get a life, better than trying to win every single argument.

Likewise. He just couldnt take criticism.