Comment by dwb

“Maximising” windows full screen, apart from the genuinely-full-screen-takeover mode you can put windows in (where they take a virtual desktop slot too) has never been an idiomatic part of the Macintosh UI, since the beginning. The “zoom” button traditionally meant “toggle between a user defined window size, and a size that is just big enough to avoid scroll bars appearing, where possible”. It goes back to the spatial desktop metaphor.

Personally I try and work with that as much as possible, though it’s not always ideal.