Browser zoom is probably the most used accessibility feature. Also make sure pinch to zoom works on a mobile as that is used even more.
Lost of people use browser zoom to some extent.
They may not necessarily be disabled.
For example I am currently viewing this site at 150% zoom. This is due to having a 40″ 4k monitor monitor positioned about a meter away. I have no disabilities but without being able to zoom this site the text would be too small to read.
More importantly – the Web Aim low vision survey shows around 44% of assistive technology users use the browser zoom settings.
Web aim survey screenshot
How import is zooming in and out (cmd + , cmd – ) for websites (Desktop view) in terms of accessibility?
It is very important to allow users to zoom into your site.
I would normally cite WCAG rules here (1.4.4 resize text, 1.4.10 reflow) but I think that would be unnecessary 😉 and instead say that common sense says allow zooming on your site.