It is a shame.
But hey, that's the poster boys for you. It's the same everywhere: the mostly advertised 'thing' gets the most publicity, so therefore makes the most money, which therefore receives the most support, and therefore is the most advertised 'thing'- and repeat.
Even when marines weren't meta 'good' (aside from specific cheese builds), lots and lots of people still wanted to play them. This would be the same for if any other faction were the true poster boys of
40k: but hey, it wouldn't be modern
40k without the boys in blue everywhere.
And now that marines are good and are continuing to get support to get even better? I mean what did we expect.
But dakka just loooooves letting the salt flow