Most of the vegans I know can nutrition themselves capably using non-imitation food, but still want to be able to have a pizza on occasion.

As much as some in the hackerverse like to pretend it doesn't, eating is both an emotional and an expressive experience for some people. Expecting everyone to be a rational actor in the food world is approximately as reasonable as expecting them to be rational actors in the dating world.

Being vegan is a big change, and I ate meat for 29 years, so sometimes my body wants something non-vegan and it's nice to know alternatives exist.

I never really went vegan to be 'more' healthy anyway, so I eat similar to how I did before.

There are a million different things "processing" can mean. It can be as innocuous as just chopping something up, or complicated like pickling. Not all of it is bad.

But, as an example, the Impossible Burger notably has more fat and significantly more salt than its meat-based brethren. Sure, it may be purchased due to a perceived variety of other benefits (sustainability, animal rights, etc) totally unrelated to the healthiness of the product, but it's objectively not a healthier option.

I am not saying you are wrong, but there is a whole lot more to "healthiness" than amount of fat and salt.

Depends on the beef. I looked the numbers up before I commented, and a simple beef burger made with lean ground beef weighs in at 11% fat, slightly less than the Impossible version (though yup, I admit, basically equivalent, which is what I should've said).