The A7c's EVF is small, and by today's standards low resolution, so yes, I'd try it out. I'm reasonably certain it's the same size as my now sold M6ii, which was one of the things I didn't like about that camera. I had to shove my eye right up against it to get a good view, and even then it wasn't great.
Then there's the lack of customisable buttons, single SD card (a couple of years ago I had an SD card jam in one of the slots of another camera), fully articulating screen (I prefer flip screens) and lack of lossless raw. I also wanted the Tamron 28-200mm and wasn't sure how it would feel on the A7c. These things tilted me towards an A7iv, but the price had me hesitating, so in the end I gave up on the 'best' AF requirement and went with the A7RiiiA during his months EOFY sales.