It is true that the PD36 is heavier but the increase is weight is not that significant compared to the 18650 lights and the weight runtime ratio is very good thanks to the 21700. That is to say that being too heavy for camping, or other applications, is relative and depends on how and how much you plan to use the light and what brightness you need.
The "Tactical" is just a tagline and the UI isn't any different from the old Fenix lights.
Sure the fact that one of the modes comes on on high only allow somewhat suits the light to a certain use.
That said, the PD36 TAC is not designed for professional use: is designed for whoever likes to have a light with two modes and that can be operated with one hand.
Might be why Surefire, a company that truly designs lights for tactical users, calls "tactical" only lights that have only one brightness level. Or designed lights such as the E2D and E1D. Other than that, "tactical" and "professional" are just overused marketing terms.
The only definition of "tactical" that matters to me is my own definition. The criteria for this are:
1. Must have a mechanical lock. That is, locks both on and off.
2. Must have one brightness mode. The point of a tactical light is twofold: disabling and illuminating a target.
3. Must have one button. You don't put two triggers on a firearm. A life-critical flashlight should not have more than one button.
4. Must be sturdy enough to be used as a truncheon.
I couldn't give a rat's *** what the manufacturer calls "tactical". Most of them are full of poop.
"That said, the PD36 TAC is not designed for professional use"
LOLWHUT.
The PD36 TAC meets any reasonable definition of a light designed for life-critical tactical use. Yes, it has more than one mode, but the modes are selected by a mechanical lock-out switch. When you put the device in Tactical Mode, you get one brightness level: 2000 lumens. If you press and hold the button, you get 2000 lumen Strobe mode.
As far as camping/backpacking are concerned, if you want to hump a 21700 device into the wilderness, that's your business. I don't. I won't carry anything bigger than a AA into the backcountry.