I thought of this community when I saw this paper: https://phys.org/news/2019-04-year-ocean-heights.html I am sure many sailors already knew this was going on, but some may not have been entirely sure.
Well, the earth is thought to be about 4.5 billion years old. The oceans are believed to have begun to form about 3.8 billion years ago. I'm not sure what a 33 year snapshot tells us.
Short term studies are hard to evaluate. The largest waves I witnessed where 20'+ waves breaking over the Dana Point Harbor main jetty at the entrance. Surfers were all over the break, which started way outside of the jetty. Looked like Waimea Bay in Hawaii, 2' of sea foam on the shore as far as the eye could see all the way down to San Clemente Pier. This was summer of 1976. Made all the Surfer Magazine covers. Never have seen it again, still waiting, maybe a 50 year event? How does that fit in a study that starts at 1985 but has a data point completely outside of that particular data set?
Like Walmart forecasting sales for the next 10 years based upon a two-second window of receipts. I saw “rising sea levels” and stopped reading this claptrap.
It's only a few years ago that scientists admitted that rogue waves existed. Something sailors have know forever.