A few companies that come to my mind now that still work this way are: doist, dnsimple, Cliniko, Calibre, HeadshotPro.
Any others?
Maybe someone who is working for them can confirm or add more details about it.
Many business founders are willing to spend entire days on meetings, even though everything can be discussed asynchronously via text, and even faster.
I know that most developers dislike meetings and conference calls, and as a team lead, I consider it my duty to allow them to work without meetings.
When I launch my startups, I always organize the work of the entire team at the very beginning so that it can function without a single conference call. As a founder, I have never needed to call anyone on the team to resolve any issues.