Maybe “meeting” has the wrong shade of meaning here. The comparison isn’t to a pro-forma “let’s sit down for 30 minutes and focus on discussing this” meeting. It’s more to a “war room” continuous-until-it’s-fixed meeting that happens in response to an incident:
• bringing all stakeholders together with exactly one goal (in a startup-as-meeting, that’s “finding product-market fit”),
• where everyone in the room has domain expertise and heavily-overlapping capabilities;
• and any non-shared knowledge relevant to solving the problem that each stakeholder brings in with them, is immediately pulled out and put on the table, until there is formed a complete shared understanding of the problem,
• and micro-tasks / “there’s always another thing” tasks are then being greedy-scheduled by whoever’s free and able jumping to take them on next;
• with everyone keeping track well-enough of what the solution-space for each task is looking like, that at any time the person working on a task can drop it to work on something else more urgent+suited to them, and someone else will be able to immediately pick up that task — not because the other person had the time to document everything and make onboarding to the solution-space easy for them, but rather because everyone was learning all they could about everything everyone else was doing in expectation that they might have to jump in.
In regular work, you do heads-down work and then you explicitly decide to “have a meeting”, which interrupts your heads-down work for a while. In a war room, you’re always “in” the continuous meeting, and people explicitly decide to break off to do heads-down work while the meeting continues around them. (Usually with one ear open to notice if they need to jump back in and contribute/adjust the course of the plans being made.)
For extremely-early-stage startups (i.e. founders and no-one else), this is what every day looks like. Rather than dividing up the problem along lines of domain-expertise (a sort of human Service-Oriented Architecture for problem-solving, with single-person “departments”), you instead essentially act together as one “multi-core person” to solve problems.
IMHO, if this isn’t how most hours of the day at your early-stage startup look, then you either don’t have the right founders, or you don’t have enough shipping pressure (i.e. “too much” runway.)