I'll be adding upgrade requirement display to the upgrade buttons. Maybe yes after you unlocked them once, or with a prestige upgrade, but maybe just as default since so many people prefer it.
The Wind Bomb can be rather weak and can't reach the mountain if you do not upgrade it with the related dynamite upgrades (and also prestige ones). But I do have plans to improve it and also change the cost scaling to be lower and use based and not mountain-level based like now.
Thanks for feedback!