I thought the whole point of having a video call is to see who you are talking to, and their environment to further enhance the effectiveness of the conversation.
If you are in your kitchen, or under a tree, I definitely would like to see that because that environment will have an effect on how we communicate.
I have coworkers who are in house shares with 5 other adults all trying to work from home around tiny desks. Background blur for them is a nice way to hide some of the chaos of their living arrangements.
In the above scenarios, if I'm not certain there aren't going to be ackward things in behind me, I'd want to blur or set a custom background. Back against a wall also works which is what a lot of people seem to be doing.