If Apple solved the blurry text problem of VR, then they have a huge advantage in the pro market. Every app developer will be working on Apple VR apps: dashboards, AR training material, whiteboarding etc
It’s not a long-term competitive advantage. The same thing happened with high-DPI displays. Apple had a momentary advantage with what they call “Retina” display on iPhone 4, but soon every Android vendor was also shipping high-DPI and a few years later it was in the low-end handsets. Today it would be weird to say: “I got an iPhone because the text looks so sharp!”
Similarly nothing stops Meta from using a high-DPI screen in Quest as soon as the OLEDs and computing power becomes cheap enough (or if they are masochists and want to try a $3k version of Quest Pro, I guess).