Under no circumstance will all bugs ever be fixed, but:
1. Consistent w-fi connectivity
Appears to be only with certain routers. I can connect fine in my college classes, but at home its a crapshoot. The difference? The routers, I am sure.
2. Storage Full (when not full) issues
Indeed a most unfortunate bug. I had something similar on my Dare happen. This can be circumvented by using a different app though. Touch Player is pretty crappy.
3. Battery life
No amount of firmware updates are going to fix a hardware issue. Not everyone has it, and as I mentioned before, it seems limited to the battery itself.
4. Ringer (missing calls due to incremental rise)
Samsung NEVER fixed this on the i760. I don't suspect its fixed in the i770, and I really don't expect to see a fix for it on the Omnia. If this is a showstopper, I reccomend you dump Samsung as a brand now, because it doesn't look hopeful in getting a fix. But, who knows?
5. Flash 2.1 enablement
Flash Lite 2.1 is enabled, its what the widgets use. Maybe you meant 3.x?
AFAIK, thats the only flash lite that supports browsers. So why not install it? I'll warn you, it may break your widgets, if you use them.
I understand people's complaints, but they are akin to so many other smart phones too. The Omnia is never going to be perfect, but the i910 is a HECK of a lot better than the i900 when it was released. At least I don't see any threads like this one:
http://howardforums.com/showthread.php?t=1488158
IMO, Omnia issues pale in comparison to that.