Yes, but we can. And the German's didn't have stealth (working on it) or A2A missiles (working on those, too).
Stealth, applied to fighter aircraft, has become massively over-rated. Until you can make a weapons system invisible visually, as well as electronically, there will always be ways to defeat it. Take for instance, hiding in ground clutter. If the enemy places fighters along attack routes, and hides in the dirt, waiting to pop up and engage close, all the stealth in the world won't help you. The human eyeball with a little light, generally defeats any electronic stealth 100% of the time. I know this because at a distance of 7-10 miles, I can see an F22, B2 or F117 easily. This is true especially in a high concentration arena where visually ID'ing a target will be required prior to engaging it. Obviously, this is also why most stealth aircraft fly at night.
Stealth, as of now, is useful mostly in interdiction and ground attack missions where you know the precise location of what you're attempting to destroy. To say otherwise implies lack of overall knowledge of the realities of air combat. ROE's exist to ensure that blue on blue kills don't occur for any reason or due to any malfunction of IFF systems onboard other craft. That unknown con racing out from hostile territory and not broadcasting IFF squawks or data link, could be a damaged friendly just limping home.
Of course, in a known arena, where you have exact information (I have 5 F22's and there are 10 Mig-29's ID'd at 22 miles... so, here go the AMRAAMS) stealth would play a large factor in the outcome. This sanitized, clean OP area just will not exist in any rapidly changing theater of operations. This will be true especially in theaters where air superiority is either up for grabs, or has been absolutely attained by friendly power. BVR tactics will not be utilized for fear of blue on blue casualties in such "dirty" theaters.