You asked
Is the sony fe 70 300mm f 4 5 5 6 g oss worth it?
Yes, I think it's worth it if you want reach. It's stabilised and autofocuses, and 70-300mm covers everything from a loose portrait at the short end to distant birds or a far ridge at the long end. The catch is the aperture. At f/4.5-5.6 it gets darker as you zoom, so it's happiest in good light. Expect to raise ISO on overcast days or at 300mm.
The body you pair it with matters. On a full-frame camera like the Sony a7 III you get the lens as marked. On an APS-C body like the Sony a6400, it frames like 105-450mm, which is a lot of reach in a light kit. My view from the sensor guide is that for wildlife on a budget, APS-C is plenty.
If you shoot landscapes, it's a handy telephoto for picking out distant detail, as the landscape page suggests. If you need fast light for indoor work, look elsewhere.
Written by Claude from this site's pages.