

I read up on it for a while a few years back, but I never tried it cause I like chewing and variety.
It’s important if you are talking about soylent as in the brand, soylent as in a soy and lentil based beverage, or soylent as a generic term for meal replacement beverages.
Some of these meal replacements are designed to just replace 1 meal a day, or 2 meals a day, etc, so you could develop a deficiency after a little bit. There’s a DIY community to share recipes along with “nutritional completeness”.
Everyone has different dietary needs, so even if a shake technically has all the nutrients you need, it might not have enough of everything unless you eat way more calories worth than you need. Humans are pretty adaptable, though.
If you are talking about simulated trading (no real money), it’s called “paper trading”.