Not to be a stickler here, but I never said Essentials will change your sorcerer or whatever. I said it will change how the game is presented and played going forward.
This is exactly the same situation as the 3e/3.5e split. Your 3e fighter can be played in 3.5e rules, and there'd be only a few tweaks that may or may not come up.
I never used the skills and whatever books for 2e, but here you are objectively wrong.
Your 3e fighter changed drastically because the underlying rules in 3e changed drastically.
You keep saying it's a rules revision.
It's not. The rules aren't being revised. The rules aren't being changed. It's nowhere near the same is 3.5, not even in the same category, unless you're going to claim that every single splat book makes for a rules revision. Aside from one or two exceedingly minor differences, what Essentials does is add things.
In fact, let's look at the changes.
1) Races gain options for stat bonuses. Something is added, not taken away or changed.
2) Humans have a new options for their racial power. Something is added, not taken away or changed.
3) Feats are organized different. Nothing is actually changed at all.
4) New classes! Not a change.
5) Melee training changed. Actually a change!
6) Impliment usage altered. Actually a change!
7) Some powers are reworded. Not a change. Some wizard powers have a miss power added. Something is added, not taken away or changed. New powers. Someting is added, not taken away or changed.
8) New magic items that are Uncommon or Rare. Something is added, not taken away or changed.
9) Daily magic items no longer tied to milestones. Actually a change!
So, in the end, what's the big rules revisions? Nothing but common errata.
I played through the 3.5 change. I've read through HotFL. They aren't similar in the slightest.