I like the way yours is set up and I've thought of doing that many times, the reason I haven't is, I never know from day to day what length log or even what specie I'll be sawing. IF I milled one kind of log/specie all the time, I would have added a log deck long ago.
I don't run my mill all the time, and then when I get the bug to mill a certain log, I go get it and load it on the mill. That would be harder to do if I had a log deck set up all the time with logs on it.
Anyway, everyone has to use what works for them, and this is what works for me right now.
SR