And so if your Kuro did not suffer, then you are using it wisely and consequently would likely have zero problems with an OLed. Image retention and burn in are similar, but not the same. You are unlikely to fix burn in, however image retention usually disappears either shortly thereafter or after a pixel wipe or two automatically. Bad image retention could take longer to clear.
This review, linked off the other one, is a lot fairer. The guy you linked, knows neither how to set up Oled or Led Tvs or knows much of anything, it was frankly drivel. Standard mode, 100 Oled Light, 100 contrast, 68 brightness is a total joke.
Black crush is not a huge problem, pixels do not simply just turn off at a particular point other than 0 for Full RGB or 16 for Limited range as they should.
When they are off, then they are actually off, there is no bleeding through of back light, but dim black is just that, a very dark grey. A bright room will mask this entirely, hence supposed black crush. The best of Leds is full array zone dimming which breaks up the screen to a series of x by y divisions. So a full black screen with a few white pixel like a star field would highlight the zones, where as the oled would just show the pixels. Near black, 5%-10% IRE is where most of the arguments come and colour accuracy there. It is not straight forward and some people think 2017 models are better than 2016 ones and presumably 2018 are better than either. Personally I am happy with mine (2016 B6 55"),I can see 5%-10% ire without a problem and without much of a colour bias in my dimly lit hovel and use a video specifically for this if I am tweaking. It has not been professionally calibrated, just myself.
Oleds are not a good solution for everyone. Brightly lit rooms are the bane of these tellys. Gaming 8 or more hours straight with static huds will cause Image retention and possibly burn in. Just don't do it, don't let the kids do it.
People who have problems tend to complain on the internet forums, people who don't, the vast majority, don't tend to dwell there.