Apple killed the idea of PWAs being viable, similar to killing Flash. 20 years of vendor lock on will make mentality hard to change.
.. or enforcing & updating anti-monopoly policies
This case is more of a "lead a horse to water" situation. Even if Apple fully opened up PWAs there'd only be a small trickle of them as people developed to norms.
Its still worth pursuing. Hut the effects may not be what we desire.