So the only reason you don't do adv. techs is because the people who you fight complain about it when you use them? They must be real mature 20 year olds (if that's their age IDK). If that's the only thing holding you back then look for better players/ tournaments. I mean there is a tournamnet discussion thread in this forum, divided into regional zones. I'm pretty sure you can drive to one.
When I face somebody worse than me I usually don't play to my fullest either. IDK if that's the best thing to do cuz it's kinda misleading them about how good they're acutually are compared to you... You could try playing with adv. techs one match, see how they react, and if they react badly, play them without them, and still own them.
I say a better idea would be to teach them. When I first learned them I thought that me and my friends were at the top of our game, thought we had taken our characters (Link for me, Fox, Marth, another Marth, Young Link) as far as they could go then one day a friend of mine who played as Marth discovered the existence of the advanced techniques. Instead of keeping the knowledge to himself and using them to pwn us he decided to share the wealth and we all began to practice together (which revived my love for the game).
Eventually we all made each other better players. I began using Ganondorf and Peach, (there was a lot of character experimenting with everyone) my bro learned when to incorporate the shine with Fox as well as a lot of other things Fox is good at >.> (wave shine to spike, shine spike, short hop u-air, etc) and the Marth's became much much better. Of course Wavedashing seemed like the coolest thing ever we soon saw through the hype and were able to look at it logically.
I "wave trot" with Peach simply because she looks cool in the start of the dash animation (almost like a ghost), as well as for mind games and in some cases successful evasion, but using it doesn't make me godly. SHHFLing, float canceling, knowing how and when to do certain attacks, stuff like that is what makes a good player a good player.
It really made things feel brand new. After that our crew of friends grew exponentially and we still play a lot. You'd be surprised how teaching your friends can change things.
