The seed oil thing is mostly about the process used to create it. Seed oils are mostly processed using high heat and pressure, it's basically motor oil. Avocado oil is almost always cold pressed, so it's pretty safe.

That's the rule of thumb. If a vegetable oil is cold pressed it's probably OK, of course you want to know the fatty acid content profile of the type of seed used and figure out if it's something that works with your diet. Also consider fat soluble vitamins, all sorts of different plants have different nutrition profiles, and there are vitamins that you can only get from animals and others that are more prevalent from different sources.