The traits and failures you are describing could be attributed to anyone including an engineer.
A good business person moves mountains while keeping builders free to build.
Require both.
Technical is important, but just saying that it is easier for the business side to toot their horn.
For example if you want to sell to X market, hire a person from those companies, that isn't rocket science.
Technology doesn't stop scaling in complexity the larger you get, or the business hits a ceiling on what it can hit in revenue and growth.
It's cool if b-school teaches other wise :)
Both the business founder and technical founder has to grow.
Which one can learn to scale to the moon easier?
I wish all my friends well on any side of co-founding.
The thing that doesn't work is trying to grift someone else's hard work and leverage them.
Builders build.. sellers sell.
Learn to deliver and ship consistently or someone will.
Something like over 90% of startup founders get replaced as CEO if it grows faster than they can.