Last year, Greg Osuri decided he’d had enough of the Bay Area. Between smoke-choked air from nearby wildfires and the coronavirus lockdown, it felt as if the walls of his apartment in San Francisco’s Twin Peaks neighborhood were closing in on him.

“It was just a hellhole living here,” said Mr. Osuri, 38, the founder and chief executive of a cloud-computing company called Akash Network. He decamped for his sister’s roomy townhouse in the suburbs of Columbus, Ohio, joining an exodus of technology workers from the crowded Bay Area.

But by March, Mr. Osuri was itching to return. He missed the serendipity of city life: meeting new people, running into acquaintances on the street and getting drinks with colleagues. “The city is full of that — opportunities that you may never have expected would come your way,” Mr. Osuri said. He moved back to San Francisco in April.

The pandemic was supposed to lead to a great tech diaspora. Freed of their offices and after-work klatches, the Bay Area’s tech workers were said to be roaming America, searching for a better life in cities like Miami and Austin, Texas — where the weather is warmer, the homes are cheaper and state income taxes don’t exist.

But dire warnings over the past year that tech was done with the Bay Area because of a high cost of living, homelessness, crowding and crime are looking overheated. Mr. Osuri is one of a growing number of industry workers already trickling back as a healthy local rate of coronavirus vaccinations makes fall return-to-office dates for many companies look likely.