Re: [w3c/manifest] Allowing only site-triggered install prompt (#627)

"If your website is installable, offering an option within the UA user interface to install that sounds good to me." - I completely disagree. The page could be "buyable", so the UA would add the Buy button. Or the page could be "schedulable", so the UA would add "Schedule" button. Or the page could be "callable", so UA would add the "Call" button.

UA interface would get extremely messy (or extremely large, giving less area to the site content). The behavior would vary across UAs, so the author can never be sure, how many users are going to get angry on some minority UAs. All such things should be only allowed in the website content area, so site authors have control over them. If we give UAs so many chances to improvise, we only create the space for UA users to argue with UA authors in the future decades.

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