That may work in a perfect world when you are the only airplane in the sky. The other 20 aircraft are now going to be late because you decided to slow down a little early. It is really a pain when you have to reduce speed 150-180kts because someone in front doesn't want to get there early. If you really want to slow down that bad, please do it before beginning the arrival. That will allow ATC to sequence faster traffic ahead of you instead of forcing everyone on the arrival to fly
your speed. We had :30 min added one night because the CRJ that took off ahead of us (same route, LEX-CLT) wouldn't exceed 250 kts.:banghead: Imaging taking off in your CRJ and being kept behind a PA-28R for 250nm.
Slowing down going the opposite direction from your route? Great

sarcasm

, the people going
that way can't speed up or climb because you are in the way. It's like the guy on the interstate that slams on the breaks for no reason. It doesn't have that much effect for him, but the chain reaction affects the 20 cars behind him.
Try landing a plane with a 40 degree wing sweep and a 2 degree bank limit in a strong wind and you'll be asking for it too. Also handy when the ATIS winds are <5 kts and I am looking at the runway through the side window.