Which model hub do you have? If it’s one of the Wi-Fi mesh models, those have some known issues with edge drivers at this time. You should still contact support, but let them know right away what model your hub is.
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The first person you get will probably just be a Samsung employee working from a script, but hang in there and be patient and it should get escalated to smartthings technical staff.
(By the way, multiple people have reported the same issue this morning, so it looks to be something on the platform side. You should still go ahead and open your support ticket because the more people who report it, the sooner they will assign resources to look into it.)
Somehow I doubt that, because they don’t generally just yank the rug out announced from under developers.
I’ve been having problems with ST all day, since the wee hours. If I try to edit routines, usually they just completely crash the app on both mine and my husband’s phones. (Both iOS.) I’ve rebooted everything in the house, deleted and reinstalled the app, all the usual troubleshooting stuff. It has settled down in the last hour or so. All of my virtual devices have been working as they should.