Is there any logical reason Apple can't provide the same update for 10.5 users?

I understand that Apple want to forget older versions of the OS but simply because a newer version comes out doesn't mean we all have to run out and spend thousands of dollrs to replace perfectly good SW. The SW I have currently does everything I need and I don't see a compelling reason to replace all of my photo and video SW. I'm also not interested in turning my 3 headed mac into a glorified iPhone.

Am I alone in this or being unreasonable? The update is not complex so why won't they do this?

I also like how the communities no longer support this version.