I've got a Samsung A5 (2017) for work. I know the problems with Samsung and I would avoid them if possible (ie. touch-wiz, messing with a perfectly fine Android) but it's a work phone and they are serviced by Spark, who don't stock many of the great Android phones (e.g. Nexus, wtf!).
I recently upgraded the firmware on the A5 (OTA update) . This (potentially) proceeded to mean that my favorite (non-samsung) messaging apps (e.g. Pulse, Messages (google), and Textra) did not receive all the SMS sent to me by more than 10 people (that I know of). Following some digging, I believe Samsung have modified their software to render any third-party SMS apps not completely functional, making me revert to their ugly Samsung Messaging app.
Has anyone experienced this and have a potential fix? Haven't hard reset yet, but have soft. And yes, I'm considering ditching Samsung for good. Pity, I thought the A5 was the first Samsung I liked..