Although, even in IN, deathbombing costs two bombs instead of one (And while deathbombing with 1 is possible in IN, the timer for it is -ridiculously- small. I've done it once.), which means that it's still FAR better to bomb normally instead of deathbomb. Yes, you're quite likely going to be deathbombing plenty anyway, but it should be an aim not to; that fact that it costs half as many bombs to do a normal one makes up for the fact that you'll bomb in some places you did not quite need to.
And yeah, PCB Reimu does have a notably large deathbomb timer for non-IN games (Although, seriously, use vsync patch on EoSD/PCB if you can, it makes a BIG difference in those two. Insignificant on the later ones.), which only helps make her the great PCB shot type in addition to Marisa scant bombs and tiny range, and Sakuya's superfast focus speed (Although with 4 bombs and useful shot types, Sakuya can still be a thing...)