The only zoom I need on a regular basis is the 100% view. For which a doubleclick is quick enough. In some other photo editors it’s also not possible to zoom in, but thanks for mentioning the option key.
FWIW: Both the behaviours you describe above (as being desirable) work that way on the Win version.
(One can also use the Cmd/Ctrl key - but it’s not necessary to do so).