well some devs give tips on how they looked/solved at a specific problem and explain, how they solved it. But that is not achievable in 5 minutes.
Viewing post in Video dev log length preferences
You're right, which is why I would recommend doing two types of videos -- a shorter one sharing only major updates and longer ones where you can go into the details of problems and game mechanics. By separating your videos like this, you'll also get a good idea of how many people have a "shallow" vs a "deep" interest in your game. The players that are really interested are going to be the ones that watch your in-depth devlogs.