Being a RISC OS software developer is going to be an expensive business if one has to buy a variety of machines in order to thoroughly test and debug code.
Perhaps we just have to accept that that is the way it is.
By way of illustrating this viewpoint, let me comment upon how delighted I was when my software, developed on StrongARM, worked straight away on Iyonix. Even so, in retrospect, I'm glad I bought an Iyonix, as two bugs did later emerge that a RiscPC forgave but the Iyonix did not. I'd not have found and removed those bugs without having my own machine to work with. At the recent Wakefield Show I found out that my code does not quite work properly on an Omega. Alas, I'm not willing to buy an Omega to sort that problem out...
So, I guess, a few developers (many coding for freeware) are hoping that the some of the titles that don't currently work under the developmental RISC OS 4.40, will work, as it becomes commercially release ready.
Paul's evolving and changing list could, perhaps, prove to be an interesting indicator of how backward compatable the A9home is becoming.
And I have to decide if I feel about the A9home as I do about Iyonix (I bought one) or Omega (I did not).