So where do you want to spend that money, time, and resources instead?
• Making really tasty food for the foodies, rather than meh food for everyone (including people who don't appreciate it).
• Art
• A really big Minecraft server
• Doing something about the fact that populated islands are sinking into the ocean and some biomes are changing classification multiple times a year and we're all just sitting at computers and manufacturing thneeds.
Pretty much anywhere else, really. Wasted money, time and resources are wasted money, time and resources. If we could replace food with magic pills – and somehow ensure that the money, time and resources saved weren't just snapped up by the already-wealthy, leaving everyone worse off – why not do it?
Also cramming 2000 calories into four or five pill sized spaces is practically violating the laws of physics, is it not?
I'm aware, yes. That's what a nutritionally-complete pill would enable you to do.
I mentioned "home-cooked meal" for a few reasons.
1) Some people seriously underestimate the cost and labor that goes into small-scale commercial cooking. Such folks will _usually_ have a better understanding of the details of in-home cooking.
2) Some people have decided that all food that one gets at a restaurant is inherently unhealthy.
3) If you plan well (and/or have a large surplus of time and energy) you can totally set things up so that you can eat home-cooked meals every day. That's what leftovers are for.
> ...cramming 2000 calories into four or five pill sized spaces is practically violating the laws of physics, is it not?
I very much doubt it. I has been decades since I studied any physics, but I'd expect that there are many examples of substances that pack at least 2000kcal of energy in four or five pill-sized spaces. As mentioned elsewhere, it's a biology problem, not a physics problem.
If you could replace a typical home-cooked meal which cost $3->5 in materials and at _least_ half an hour in personal labor with a pill that costs $0.03->0.05 and can be produced in the thousands per hour, that's a significant win. And if you can build those pills from the byproducts of vats of cheap-ass microbes (rather than through ordinary (or -worse- factory) farming), then that's a massive win for both the environment and animal welfare.