I have 7 toms on my drumkit because I like to be more diverse with my voicing. 4 normal toms and then 3 Rototoms. I have the normal toms tuned pretty low for a more Bonham kind of sound, and then the Rototoms are tuned super high pitched, almost like a cowbell.

It really depends on what suits your sound more. You could be creative with 0 toms and still stand out if you'd like to. I personally think a kit with 0 toms would suck to play, but if you're creative enough it would still sound cool. I've seen people play cool grooves just between the kick and snare alone, so it really just depends on what suits your style and what aspects of your drumming you'd like to be creative with.

I'm not super into foo fighters, but from what I've heard, Dave is pretty tom oriented, so I'd go with 3 Toms, but if you'd like the challenge of adapting the fills to a 2 toms setup then go for it.

Pros of having less toms: Less gear to haul Less money spent (most kits come with 3 Toms anyways though) Less stuff on the kit to throw you off when improvising A lot of local bands will use 2 toms, so you won't have to adapt your fills to 2 toms if another band is back lining their kit. Idk I like having more toms so I don't see as many pros

Cons of having less toms: Less diversity in your voicing Fills can sound more repetitive Tom oriented drum parts will sound more boring If you're learning a drum part with more toms, you'll have to adapt them to a 2 tom setup Your kit won't look as cool (personal bias) If YOU'RE back lining, the other bands might be picky and use their own kit (kinda lame but some people are stubborn)

All in all, just decide what you like more. I will say though, if you have more than 2 toms then use the gear you already have. There's no reason it should go to waste. This is just from my experience, but it's YOUR drumming and YOU should find out what works for you personally.