I didnt say they are not important. There are players for GaaS and players who dont play GaaS. A successful GaaS is a harder thing to achieve.GaaS are important because that is what players are playing. Let’s be real, they represent the bulk of profits and platform engagement for all platforms.
But what I think you’re describing is that platform holders still need to meet the expectations of their hardcore base. Something Xbox hasn’t really done as well these last couple of years, and Sony also now seems be trending in that direction as well.
Partly because it requires huge hours of dedication and long term investments from players. For example a single player game makes room for another single player game after its finished. A GaaS model requires constant engagement for its economics to work, and players have less time and money to invest on multiple GaaS games especially if one has captured their hearts. Also their success is decoupled from the platform branding because platform exclusive GaaS have less chances of succeeding economically. There are much more financially successful non-GaaS games we can name than GaaS games for that reason.
So yeah they need to meet expectations of their hardcore base because it is the main foundation of the platform's market share and branding. It is the reason why MS and Sony are keeping their GaaS games (i.e Minecraft and Destiny) on competing platforms.