Not sure that fair at all because as you say later on: Mike Gartner was good-very good for almost his entire career.
I think he is a poster child for nearly the opposite, just below the Roy/Bourque/Lidstrom tier.
In 96 and 97 combined Gartner was still an top line forward and 22th in the NHL in goals scored, 61th in points.
The first time he was not a legitimate top tier first liner (he had a Calder consideration in a normal year rookie start) in the nhl was only his last season in 1998 (the year before he was second in goals on his team, nice 32 in the starting early sign of DPE) and retired immediately.
Compiling to me, its accumulating stat for a while without being an impactful top 6 (or first 2 pair D) nhler, Marleau, Joe Thornton last 3 seasons for example. It does not tend to move the needle much outside most game played or reaching round career numbers, as a compiler is not scoring much per definition.
People having him in mind for compiler is just because of how big his number are, which is simply having been really good for a long time in an high scoring era, not because of any actual way he played or his career.
Same would go for a Ron Francis, his godly numbers are not from being a compiler, he retired immediatly after the first season he was not a legit bottom tier first line center in his career (almost lead the Canes in points the year pre-retirement one and started with some calder vote at 18, and was good every single season in between)