A person can commute on any bike; it doesn't take a special bike to do that. I'm 73 and I commuted for years on road bikes with for about 10 years I was riding on 19c tubular tires, then later got into 23c clinchers, and rode on those for most of the years I ran my business, the last 10 years I worked I transitioned to 25c tires. All I had was road bikes, I did later in the late 80s got a mountain bike but never rode it to work.

I knew a guy who commuted for years on one of those industrial cargo trikes! He did that because he would go to the grocery store after work and pick up a bag or two of groceries to take home and put the bags in the rear of the bike that had a cargo area made of metal.

Anyway, any type of bike can be used to commute on, it doesn't need to be special, it doesn't need to be scientifically figured out, just pick a bike and ride it.