I also use Safari as my main browser, but do have some gripes.

The one that bites me every day is how I cannot pick an arbitrary search engine. The ones they have are very few and awful.

One that bites me on occasion is the inability to selectively disable JavaScript per website.

Another is the atrocious permissions management for extensions. On iOS you can’t even deny access to a specific website until you allow it once first.

One that bites me rarely is AppleScript support being slightly worse than in Chromium, specifically there being no way (other than GUI automation) to make a new Private Window.

One that hasn’t bitten me yet is the ugly pill-shaped tabs in Tahoe, together with the removal of the unified tab layout.

The most frustrating part is these are very easy to fix. Note also that this isn’t an endorsement of Chromium, there’s a reason those browsers aren’t my main. Right now there isn’t a single web browser I like and that does everything I want acceptably. But Safari is the least bad.

I actually built a content blocker which gives the ability to selectively block javascript (or any data type for that matter) https://minim.sweetpproductions.com

:)