Considering the salary offered by FAANG and other big tech companies, saving 200k$ is very doable. Yes some people are in credit card debts, and that proportion is higher than it should, but saving that amount of money is not unheard of. Most people just spend all they have (and a little more), which leads to not having that kind of savings.

Doing so in just 4 years may be harder (again, depends on your spending), but if you have a little nest before then I don't see what's so strange about it.