> Many projects don't make any progress between mid of June and late August, depending on the number and diversity of stakeholders

That's what, less than 8 weeks, in a year of 52 weeks, where things progress slower, and this is supposedly a big issue? And even if you know and understand that these other people are humans too, just like you, this is seen as "narcissism" and "selfishness", that they take vacations in the summer?

I'm sorry but this is borderline insane and inhuman, do you never rest? I understand your point of view when we talk about huge corporate entities with thousands of employees, but even SMBs with like 200 employees end up in a situation where people with specific jobs will have to be unavailable for weeks (as again, they're human just like you) and you can't realistically hire people to replace those for just some weeks.