My reading of the thread, as well as watching the general discussion of PWAs over the last 6 months, is not "what does Safari need to support", but really are PWAs the right answer?
If the comments were limited to "Safari needs X and Y", and there was no discussion about the an inherent need for PWAs it would be a pretty short thread.
Safari's support for PWA features is a proxy referendum of PWAs themselves.[1]
[1] And Google's desire to not being dis-intermediated as an arbiter of access to information/functionality via web properties.
If the comments were limited to "Safari needs X and Y", and there was no discussion about the an inherent need for PWAs it would be a pretty short thread.
Safari's support for PWA features is a proxy referendum of PWAs themselves.[1]
[1] And Google's desire to not being dis-intermediated as an arbiter of access to information/functionality via web properties.