Seems to me that you are generalizing from a far-fetched example.
I am not saying that users can never benefit from PWAs. I am saying that globally, I am not convinced that PWAs will improve the life of iOS users. Just like I don't feel like Electron is improving my life. Slack would maybe have to make a proper app if they did not have Electron, it's not like Salesforce doesn't have the money. I could even go further: if it was actually expensive for such companies to write apps for the platforms they need to support, maybe they would open their APIs. Slack/Discord are glorified IRC messengers, I would love to have a lightweight client to use them (instead of getting a full copy of Chromium for each).
I am not saying that users can never benefit from PWAs. I am saying that globally, I am not convinced that PWAs will improve the life of iOS users. Just like I don't feel like Electron is improving my life. Slack would maybe have to make a proper app if they did not have Electron, it's not like Salesforce doesn't have the money. I could even go further: if it was actually expensive for such companies to write apps for the platforms they need to support, maybe they would open their APIs. Slack/Discord are glorified IRC messengers, I would love to have a lightweight client to use them (instead of getting a full copy of Chromium for each).