Celebrate? Dear god, don't put words in my mouth, I'm not celebrating and showcasing anything that United does. Yes, but talent from within their league is very similar to what Bayern does. Bayern does have the advantage that they are the only premier level club in their league though. If Man U had that advantage, they would've ended up with Kante and other internal stars. I'm not celebrating Man U for what they do or bashing Bayern for that.
The thing where Man U is way behind those clubs is actually integrating the talent they bring into to form a cohesive and successful unit. We are currently talking about bring in talent, and Man U can do that, and they've been doing that, and they'll continue to do it. The problem is making them into a successful 11-man unit. That's what they suck at post-SAF. During SAF days, they were much more like the current Bayern of just being very efficient and effective on the market, and also developing talent.
On the global scale as far as pull and bringing in targets, Real and Barca are by themselves. They are really the only ones with enough pull to scare any other club. That doesn't mean they are the most efficient or effective clubs on the market though.