reset=# is pretty much worthless. I can't really see an instance were I'd use it instead of combat or target. The whole point of /castsequence is to be able to push the button over and over again to do multiple things. If the timer increases with every button push... uh... ya. Pointless!
I understand where your coming from here (and where he is coming from with that)

But I don't agree, I still use reset=10 (or whatever) for a few macros...

For example, faerie fire and barksin on my druid...

It lasts 40 seconds, and on some fights thats not long enough.

I use /castsequence reset=40/combat/target/alt Farie Fire(), Barkskin()

I use this because it saves a "quick access" hotkey for PVE.

I'm NOT trying to claim that reset=x is great, or really useful... just that it can be useful is some situations... enough where I don't want it removed.

Working as a hard time reset (ignoring spamming) would be really nice for multiboxing, but I think it would be to much automation for normal play.