Technical leverage, in groups.
Technical builders, the people who actually write the code and ship the systems rather than manage the people who do, tend to get the least peer support of anyone in a company. Founders have founder groups. Executives have executive coaching. The senior engineer or technical co-founder making architecture decisions mattering for years often has nobody at their own level to actually check their thinking against, and defaults to figuring it out alone.
A peer group specifically for this role solves a narrow but real problem: a room where a hard technical trade-off, this architecture versus the other, this hire versus the other, this rewrite versus the alternative, can get pressure-tested by other people who have actually made calls like it, rather than by a general business audience unable to evaluate the technical substance underneath the decision.
A formal format for small peer groups of technical builders specifically is still being designed. The closest thing running today, in public, is Mentoring and Power Masterminds, where this same kind of technical leverage already happens inside a room of real peers.