The old forum also happened to exist in a very turbulent time when Studio was fresh on the horizon (and unstable as heck), GM6 was slowly fading out of favor as later versions added more and more features and QoL improvements, GM7 had licensing issues (eventually rendering its full version impossible both to purchase AND use) and GM8 had been around for quite some time, improving further on GM7's QoL changes and being close to Studio in functionality. With four concurrent versions that all were pretty widespread in use (and many power-users running more than one!), it made more sense to make a statement about which camp you were in. These days, everybody either uses GMS2 or is some mix of pirate or dinosaur.