I will say more videos are needed, the other engines have so many more videos. I will see if I can add a few more though I dont know if my defold skills are up to par.
One problem with many videos is info overload- 1 and 2 hour videos is alot to try and digest in an electronic medium. Small chunks with links to written documentation or discussion forums work very well. Especially when you are looking for an example of one small function but all the videos cover entire games or entire learn the whole system in 2 hours format. Im not just talking Defold but instructional videos in general. I have built two moodle sites for online schools and 1 college. With hundreds of courses- drop out rate was horrendous with anything longer than 30 minutes. Sometimes as much as 80%. But smaller chunks with rewards retained almost 80% of students.
But like I said my experience with defold is only about a month now. So what videos I could offer would be very very basic at this time. But maybe helpful.