Most people can't just move to a cheaper country. First outside of Europe most countries will welcome you to be a tourist but not live their if you aren't financially independent.
Most people not doing remote jobs will also command a much lower income in the cheaper country negating any benefit.
Most people don't have so much in savings that they can just live off their savings for long even if its in a foreign country.
Move somewhere cheaper is just nonsensical advice for 99% of people.
I read the parent post and understand the context. I just don't think that poster understands how many are already "used to a modest lifestyle" because they never had any other choice.
Sacrifices have to be made to achieve anything. In Spain we say "you can't make an omelette without breaking some eggs".