You could say the same about flipping cards though. You'd either have to play a bunch of quickplay cardflip effect, have cards that can flip themselves or be played facedown, or take at least a turn winding up and flipping all your stuff facedown.
I mean sure it does(probably) take a turn flipping all of your cards face down, preventing you from doing anything else. But it'd take that plus stars to instead make all of said cards not take the damage. As for the firebase v PGW comparison, I mean, they really...
aren't equivalent in role. PGW is
only a face nuker. If you have even a single card that can survive the damage of the Bombardment by even one point without a 'no defending' clause she literally can't touch you for at least one more turn.
Firebase, while it may not survive the blast of Bombardment, will kill literally anything in the game thus far, including the PGW,
and can deal an entire 3rd or more of the opponents Hearts directly to their face if they're undefended. It can do what the PGW can do only slightly worse, while also not having her core weakness,
and can essentially allow you to cast a very solid damage spell once per turn without taking up a card slot.