One difference is that you can be a decent food critic without being a chef. So I think it's theoretically more feasible to start a restaurant as Joe-rando business guy.
That said, I think in both cases the business guy needs to bring domain knowledge (or an insane amount of hustle) to the table. Figuring out the type, location, and marketing of a restaurant is just as much of a make-or-break proposition as having the right chef. Similarly, on the software side you need either pitching/fundraising or some kind of go-to-market skills, whether it be enterprise sales or consumer marketing. Entrepreneurial chefs and developers at the top of their game enough to offer something compelling may be able to do this themselves, but in most cases a partnership with the right business person will have a multiplicative effect on the results.
Infact I'd go as far as to say that a critic has no place running a restaurant. (Caveats below).
Someone who knows the industry and understands what the local population wants? Good chance, most critics (imho) don't, they want the best possible food and service for the (generally) lowesat price. (There is nothing wrong with that). A good critic doesn't make a good restaurant owner though.
Akin as a good blogger about tech wouldn't necessarily be the best person to run your startup.
That said, I think in both cases the business guy needs to bring domain knowledge (or an insane amount of hustle) to the table. Figuring out the type, location, and marketing of a restaurant is just as much of a make-or-break proposition as having the right chef. Similarly, on the software side you need either pitching/fundraising or some kind of go-to-market skills, whether it be enterprise sales or consumer marketing. Entrepreneurial chefs and developers at the top of their game enough to offer something compelling may be able to do this themselves, but in most cases a partnership with the right business person will have a multiplicative effect on the results.