In medium-large companies, work and promotion are about showing off. Even if you do real work it's more important to be noticed than to do it.
In that light, I don't understand how you and the OP could consider that it's preventing to do real work. Powerpoint is the real work. And it shouldn't be difficult to justify spending 1-2 days on it, with 100 people assisting to the presentation as witnesses, unless your manager really doesn't want you to give presentations (it's showing off your team so it's good for your manager too).
I get it that it's not part of the engineer mindset of course. If I have to give some advice to strong engineers who do good work, that would be to take credit for your work.
That captures a lot of what I was trying to capture. However, the intent was for people to cover work that they are doing (lowering prep time, immediate understanding), tech they are researching (again lower prep time, immediate understanding).
A lot of technical presentations we did are no different than what you would do explaining tech within your team. A few diagrams, and understanding of the core of the tech. Scaling to more than the safety of the team is really where I think people would rather have 3 meetings with 3 different teams to do a knowledge transfer than take the risk of being in front of collecting 5-10 teams worth of engineers.
Looking over the comments, the real gap I expect is the lack of peer management support and encouragement. And expectation that mentoring and teaching peers should be part of the leadership expectations. My view are is the the strongest engineers are the ones that accelerate and multiple the work of themselves and their peers, but there are a lot people who subscribe to the "army of one" 10x engineer philosophy.
In that light, I don't understand how you and the OP could consider that it's preventing to do real work. Powerpoint is the real work. And it shouldn't be difficult to justify spending 1-2 days on it, with 100 people assisting to the presentation as witnesses, unless your manager really doesn't want you to give presentations (it's showing off your team so it's good for your manager too).
I get it that it's not part of the engineer mindset of course. If I have to give some advice to strong engineers who do good work, that would be to take credit for your work.