Reasonable for whom?
In sufficiently small companies yes it makes sense for everyone. In larger and more regimented companies doing the Greenfield project can (and often does) lead to promotions and higher earnings.
Teamwork is fine, but when salaries and promotions are individually negotiated you have to look after number one.
Agreed, if you have not worked at a FAANG (or adjacent) the advice in these threads can work very well for you or very much against you.
The level of politics, promotion, promotion packets, leveling is a whole different level. That is not to start on PIP, hire to fire, etc...
You need to know the game if you're going to play it.