We actually tried building a PWA for a previous iteration of Parsnip and it was a terrible experience. You can still try it here: https://beta.parsnip.ai/
I don't think PWAs are ready for mass adoption yet... and they may never be, as they are trying to shoehorn an old technology into a new mode of interaction. See also https://news.ycombinator.com/item?id=32276188.
Thank you for the link! I briefly skimmed the content and my experience was quite normal for website. Maybe load time was suboptimal couple of times, but it should be improved by CDN. It is much easier to just click the link and get to the the content momentarily, without the need to download and install app (thinking in process: is it too big? Why it should be that big?) and occasional "login with X" stage. It could even be a classic website, without PWA, using server-side rendering (good for search engines too, giving you free organic traffic).
I don't think PWAs are ready for mass adoption yet... and they may never be, as they are trying to shoehorn an old technology into a new mode of interaction. See also https://news.ycombinator.com/item?id=32276188.