I don't think people are complaining for the sake of complaining. Those coming from pre-2016 models just seem to notice that screen response times are worse now, which is odd of you come to think of it as technology normally evolves to smaller, quicker, etc. Unless those observing smearing have a 'bad' panel, but that's already been described in another thread and I don't think there is a lot of difference in panels anyway as this seems to be an issue going on since 2016 when Apple introduced the Touch Bar. These MacBooks had new screens with wider colour gamut, better colour accuracy and more brightness. It seems that the cost to be paid for this was a slower screen response time. The fact that a lot of professional reviews on the MBP 16" don't mention the smearing can only be explained by the fact that these reviewers didn't make a big jump from an older model (pre-touch bar) to the newest model but became used to the smearing on the 2016 models and later. Couldn't this explain why some people notice this as an issue, while others don't?