It depends a bit on your build and your playstyle.
I had FA for a while in one of my earlier DB/WP builds. Even with QR + Stamina + IOs the impact on endurance consumption was very notable in longer fights, especially when I used a lot of AoE attacks. Unenhanced FA has an end cost of 0.78/s and that's a lot ... actually too much for the power as it works now imho. In comparison: the four WP toggles combined have an end cost of 0.84/s (unenhanced). Physical Perfection adds 0.21/s to your recovery (unenhanced) and that certainly helps to compensate a bit. However, with some endurance management, maybe a short break now and then or with the help of some blue inspirations it's still ok even without Physical Perfection. I'd say it's nice to have, if you have room for it, but certainly not needed.
Maybe you should take a second look at FA, though.
It gives +5% ToHit (enhanceable), +20% Accuracy, ~60% ToHitDebuff resistance and +60% Perception. This is not bad, but you'll only need it in specific situations (if you slotted some accuracy into your attacks). It is very helpful against Night Widows (and some others) and anything that debuffs ToHit.
As an alternative there is Leadership/Tactics. It has half the endurance cost (0.39/s) and gives +7% ToHit (enhanceable), ~48% Perception (plus some resistance to -perception powers), and protection against Confusion and Fear. And it provides these benefits to the whole team.
Just dinged level 41 on my DB/WP scrapper. I'm more than likely going to Focused Accuracy route for obvious reasons with DB/. Question is however, I already have QR and Stam, would taking Physical Perfection after FA be overkill? Let's just assume for now QR and STA are both slotted with 3 SO's for end recovery.
Thanks in advance.....