If you spend months in isolation, true, but if it is a matter of answering something on the spot vs the next day that is not a problem.

But the main point of my comment was that the situations in which I have felt slow, I have later realized that is only because some other people confidently state the first thought that comes to their mind. They are quick to answer but not any quicker to the final conclusion (which may be days away).

And depending on maturity and team dynamics, that may or may not be bad thing. A couple of people confidently spitballing some bullshit between them can reach a solution quite nicely if there is no prestige involved and a shared understanding that "oops, this was wrong, try again" is an expected part of the process.