That sounds great in theory, but how would you properly fund foreign interventions, the war on drugs, dragnet surveillance, bailouts, anti-competitive corporate regulations, and other unpopular policies if nobody is willing to pay for it?

That's why bundling taxes in a few non-optional packages is so important. Otherwise people will try to selfishly evade paying for services they believe they don't need, and needlessly pry into public finances despite having no expertise in it.