I shot m43 mirrorless for several years just using the LCD on the back.
Then I got a Sony FF mirrorless and shot it that way for a few months.
Then I got a 45 degree VF for the Sony setup and I really like it. And, so far, I've only shot it for WA.
I can see the info on the display better with the VF and its magnification versus how well I could see it on the LCD.
Also, for WA of big fish (e.g. sharks), it's easier to use the 45 and get an upward shot angle. Especially if I'm on the bottom or near it.
Also, if you have old man eyes, like I do, you can adjust the diopter on the camera's VF so that you can easily read the display when looking through the VF - when trying to read the info on the LCD might not be easy at all.
It's not ALL roses, though. There are some times when I think "this would be easier if I was just using the LCD". But, it's an either-or choice. With the 45VF mounted, it blocks my view of a good chunk of the LCD. And, to make it all work, I have to set the camera menu to keep the electronic VF turned on, which turns off the LCD. So, to switch back and forth, I would have to change the camera setting each time.
I have never really attempted to shoot macro. I'm surprised so many people are saying the VF is preferable for that. I would have thought using the LCD would work better because you could keep the camera at arm's length - so you physically don't have to get as close to the subject. So, less chance of scaring it off.