Many people didn't Bladesing to melee fight, many people used Bladesinging every combat to get an INT Bonus to AC and Concentration checks.
The intention behind Bladesong was never for Bladesong to be Always On.
"While your Bladesong is active, you gain the following benefits:"
In practice, the ability is always on.
I like the Wizard class, as a player, I enjoy Resource Management. The change to Bladesong, makes the subclass more appealing to me.
Now, my inner Power Gamer of course wants to have an Always On boost to AC and Concentration checks.....so that part of me is doing this:
Yeah, the part where you're right, you're right. That some people didn't pick bladesinger to bladesing - be in melee combat. And that's kinda abusive.
But I don't agree with anything else you said.
First, let me disabuse the strawman you set up. I never said it was always on. Said you could use it in most combats. Which implies that there are combats you can't use it in. Plus there's always times it's not up yet - get surprised, foes beat your initiative, you are worried about number of combats so you are waiting to see if this will be tough, you've dropped to zero and it's stopped, etc. So any point about "always on" isn't actually addressing any point I made nor the actual effects of play.
So, let's actually get to the point I actually made. Bladesinger is a subclass specifically about bladesinging. Going into combat and combining magic and melee. As a wizard chassis you have lowest HPs per level of any class, no or light armor, and are MAD so you're not pumping CON like a fighter. Regardless how
your inner powergamer (your words) wants to use it, having an AC boost is actually integral in order for the class to function as designed because of the low survivability of the chassis otherwise.
That some people abuse it by not going into melee IN NEVER a reason to penalize those who use it correctly. Rather, find a limitation to the power that properly allows the class to function as described and intended while limiting those who want to abuse it for a high AC and Concentration boosts with normal caster usage.
Again, if we apply your solution to people multiclassing fighter for survivability, it would be to limit the number of encounters per day that a fighter could wear armor for all fighters.
So on one side, we have your thoughts that the wizard doesn't have enough resource management and you want more because you like that, and on the other side we have the actual suitability for the subclass to fulfill the role it's designed for.
It's a clear choice.