If you are wanting reviews to take 6 months, there won't be any reviews of the phone until half way through their sales cycle. I agree things change over time. I have a Pixel 5 and on release it had horrible brightness sensing problems thanks to the under screen brightness sensor, and that got a lot better after a couple of months. But it is unrealistic to expect people to wait 6 months to see if a phone might be good. That was doubley true when most phones only had 2 years of support tops.

It's a little better now, but if you aren't buying a phone when it first hits the market you are shaving time off the life of the phone, if you are like me and camp on a phone for years. Heck, for a long time cell phone carriers were selling phones who's EOL had already come, it was bad.