There is no question that the so-called “retirement” of fonts from the Adobe Fonts service is a major inconvenience to our customers who designed content using those fonts.
Some points to consider:
(1) Any “kits” for web page use that are currently active for a particular account using those “retired” fonts will still be available for the accounts that created and still use them.
(2) The good news is that these fonts are available from the source font foundries directly and as mentioned in this thread, some discounts are being offered by those font foundries for a limited time, at least for desktop usage.
(3) It was not Adobe's decision to no longer offer those fonts. Within Adobe, there was and still is great angst about this situation. The type foundries in question made their own business decision to no longer offer their fonts via the Adobe Fonts service, presumably believing that they could increase their own revenue by only offering them via direct licensing and with a different business model and licensing terms than was available via the Adobe Fonts service. For better or worse, Adobe has no way of forcing a type foundry to indefinitely continue to participate in the Adobe Fonts service.
(4) Adobe didn't delay notification of the end of availability of the fonts in question. Notification to affected customers could/should have been better and preferably personalized, but Adobe wasn't trying to hide anything here.
From a personal point of view, I too would be very disappointed if I chose a one or more fonts or font families from Adobe Fonts for use as standard fonts for my traditional publishing and my web pages and that were later no longer available via that service. On the other hand, and again this is my personal perspective, if I or an organization I represented were to depend that much on said fonts for a longer term, I would pretty much consider the Adobe Fonts service not only as a great, no additional cost tryout medium, but also as a prelude to getting a perpetual license directly from the foundry to avoid unavailability in the future.