I think the main point is without a major fumble, it's a harder hill to climb, combined with the legacy library context from the prior gen when digital really started to take off. It isn't the 360 era with a year-late, overpriced, difficult to develop on architecture with the PS3, nor is it the PS4 era with the disastrous launch PR, high bundle kinect pricing + lower spec console with the Xbox One.
Both are doing really well given the supply chain issues, Series consoles seemingly better in early 2022, with great games already launched + in the pipeline (well, no idea roadmap for PS currently). Mind you it's not an impossible task of course, just nowhere near as easy to flip the switch compared to prior gens where there were large and glaring issues on one of the platforms from the outset. GP does change that up quite a bit, which is where the marketing (outside North America) really needs to hit its stride.
Edit: We also need to see in detail what the new PS+ actually looks like outside of the high level descriptors, and how it develops over the next 1 - 2 years. Even without day one first party, it can significantly soften the GP appeal to completely switch if major indies and other 3rd party games launch into it. Along with whatever 'beyond console' plans are in the works i.e., PC, streaming etc. It's more of an ecosystem competition now, along with quality and cadence of exclusive 1st party titles that will drive conversion (genre and markets are pretty different between platforms now, many have preferences determining choice here), or in cases simply secondary systems from an individuals primary box (Series S as a GP machine is perfect).
