On the official Apple spec sheet it states clearly that they’re thicker. Not by a lot, I’ll give you that, but they are. When comparing 2019 16” to 2021 16” models. If you go even further to compare between 15” 2019 and 16” 2021 – because now there is no 15” option, then the thickness increase is very noticeable just by holding the thing. Checked that in real life btw, not going off just spec sheets.