I wonder how many people will find out that macOS 10.15 will "kill" an app or two which will annoy them once they have installed it.
It happened with iOS 11 too. Lots of fun games I had bought and played a-lot which are not 64-bit, therefore not able to be used anymore.
On macOS I sometimes get the occasional "not optimised.." so, these apps will be "broken" in september (IIRC, some apps related to X-Plane 10)
Sure, I understand the reasoning, and that the developers should get to work, but apps can be abandoned by the developer and therefore you as a user get kicked out.
I keep an older iPad 3 with iOS 9.3.5 just for the fun of those old games (like Tiger Woods 2012, DooM).
Might need to keep a macOS 10.14.x partition just in case...