Not everyone has access to proper ingredients/tools/knowledge that are required for maintaining a proper diet.
Actually, everyone does have this. Whether they choose to use it is another story. I've yet to meet a person on this planet though that doesn't know that you can't survive on chocolate and potato chips. The stomach cramps are a pretty good clue.
The vast majority of food is perishable and does not transport/keep/distribute well
Thankfully, over the last 20,000 years we've learned to live of the things around us, like animals and plants. I don't understand this argument. There is no requirement for food to be distributed over vast distances and times. The fact that we choose to do this is a societal choice.
Lots of people like food too much and overindulge.
So? The already have things like Slimfast for these people.
But I don't think anyone would argue that sleeping is a "good" or "efficient" use of time
Life is about living, not being efficient. However you choose to spend your time is the best use of your time. There is no race to win.
nor do I think anyone would be opposed to providing more or better sleep to those who currently struggle with it.
Are you honestly suggesting that Soylent is better for someone than a proper meal? You better have a pretty long list of peer reviewed research to back that statement up if you are.
subjectively arguing that Soylent is stupid because you like to stuff your face
Enjoying food is not "stuffing your face". Perhaps if this is what your relationship with food is I can see the appeal. That's abnormal though.