Okay so the strength of betting in position is the only advantage you get from it? Okay lets start this.
1 - It allows you to act last. The information you can gather in this position and the advantages it can create for you are huge. Esp if you have a weaker player in the pot.
2 - You can escape hands without investment, where if you were earlier you could've been put into a position where you invested too much and now you have to play it out.
3 - You have more options as far as how you play your hand.
4 - Your strength can be hidden easily
5 - You can bully and steal just based on your position alone, irrelevant of your cards and stack size or what street the action is on. Because your range is larger people have to worry about hands they wouldn't usually expect, it's the bad players that'll just because "you have the round thing in front of you". If the flop comes rags and the guy out of position has q/j or something, you could've hit, and that person knows that. He's now on a draw and is now scared that you have him dominated. They might call you down one more street, but you can take it there if they don't spike, purely because of your position.
6 - Position isn't all about the preflop play.
Also - it's a good think to look weaker in position but to also play your range in that position, there is a reason why it's powerful and there is proven math to support it, hell, even the psychological side of it is "proven".
I would've rephrased how you started this thread and stated something more along the lines of, "Do you guys view the button the same way as I do?" or "should I swap up my play a bit and play a bit more aggressively middle with rags". You would get more constructive feedback.
To answer those questions, first one, already answered it with a short list. As for the other one. Yes you should play more aggressively in middle or early from time to time, mixins are important, even if you get busted in a bluff you can use that looser image later and cash in.
But in no way is the button weak or have the fundamentals of the game changed because the player base understands that position has a wider range and bluffing potential. Go to the next level, mix up your game and remember, sometimes donating for image is a good play. I'd be more worried about the seat you drew and who's sitting on your direct left +2.
This is also all the more important in live play. People in live games will pick up on you changing gears and mixing up your range for no logical reason and exploit you when you're the one thinking you're outplaying them. See it happen all the time from casinos to home games.