So where does it end?
Stealth can be countered if the other guys are smart enough and throw enough technology at it, so there's no point having stealthy aircraft.
Modern radars aren't fooled by Electronic Attack techniques, so we might as well not bother with EA as it's expensive.
Modern radars aren't deceived by chaff either, so there's no point putting expensive chaff dispensers in aircraft.
Modern IR missiles have good IRCCM so there's no point putting expensive flares or IR jammers in aircraft.
There's no point using armor plating because some bullets can go through that and it's expensive.
Therefore you're saying the perfect flying war machine is in fact the Wright Flyer. And then you need lots of ships for the Navy with Tomahawks because there's no known counter to the Tomahawk....