To clarify, I've always had WiFi calling enabled. The change today was to select which network it attempts to use first, WiFi vs. mobile.
I've been having a lot of trouble with this at work. In my office I don't get a good cellular reception but my phone is connected to WiFi. However, I consistently have the problem where SMS won't send (thru Messages). Sometimes they are just really slow and they eventually go thru, though on occasion they get dropped completely (especially pictures). Sometimes turning WiFi on and off helps push them thru, sometimes it doesn't. However, I might have finally found the fix. I switched the WiFi calling preference from mobile network to WiFi. After doing this, when I send an SMS it consistently sends within 1-2 seconds. Prior to the change, they would be in the "sending" state for 5-10 seconds minimum or 30+ minutes in the worst case when they just weren't getting thru. And for reference I have a Pixel 3.
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