Yes, I know there are differences. All I'm saying is that it is perfectly possible to produce professional/commercial recordings with pretty much any interface on the market nowadays. I honestly don't think there's anything out there that is so hideously, godawfully, unusably bad that you couldn't do good work on it, so long as you have at least some idea what you're doing and know your way around. There are umpteen things in the signal chain that will make as much (or more) difference to the end result as the interface/converter. First and foremost, the music itself. If you haven't got that right, it doesn't matter what gear you use.
I know that you've been on a long quest to get the best setup you can in terms of clarity, transparency, etc. That's cool, that's your path and I think you've nailed it down well. But it doesn't mean that the other paths don't work. For instance, there's no way I'd spend that much money (or time) on things like interfaces, converters, etc. For me, they're just a convenient nut and bolt - necessary, but not really important. If I was going to drop silly amounts of money, it would be on instruments, not the gear to record them. But that's my path - I can do what I want to do with the gear I've got and it's good enough.
And I'm going to shut up now 'cos I've derailed things far enough already. Hell, maybe I'm just in a curmudgeonly mood today. It's been a long year - just ignore me folks, I'm rambling...
(Hey! Who said "as usual" back there?)