I doubt this is true. While you get a lot of resources through the quests and yes, you can revive the hero, those resources that you spend could be used wiser. Losing your hero early on is only good if you raid a lot and make it worth. For others, it´s disaster.
It is! That's the math! And I don't raid neither! I allocate lots of my Heroe's points to resource production, as you can see in the screenshot. Reviving a 1st level Gaul Hero costs, for example, merely 240, 380, 270 and 160 res plus a loss of the heroe's production of 1 to 2 hours. You would loose a lot more waiting for your hero to recover before continuing going on adventures. You would also otherwise take longer leveling up your hero for getting more points you can allocate to more res production too.