Integza is one of the few channels where I will watch every single video and be both educated and entertained regardless of the subject matter.
If they just keep on releasing videos and building stuff, even if they are not so skilled in the beginning eventually they become really skilled! It really shows that practice yields mastery.
Tom Stanton is another on my list.
https://www.youtube.com/@HyperspacePirate
https://www.youtube.com/@AirCommandRockets
https://www.youtube.com/@LesLaboratory
https://www.youtube.com/@harrisonlow
https://www.youtube.com/@michaelrechtin
https://www.youtube.com/@HuygensOptics
https://www.youtube.com/@jdflyback
Not builders per se but really informative still:
https://www.youtube.com/@Lantertronics (great electronics vids, especially analog guitar pedal stuff)
https://www.youtube.com/@machinethinking (machining history)
https://www.youtube.com/@AgentJayZ (in-depth about jet engines)
100% true, but I'd like to change the word "practice" to "interested and intentional pursuit".
Practice is rigid and structured. You can be told to practice piano for years, but you may never become great at it.
When you find something you love, you drill into it yourself. Vertically, horizontally. It absorbs you. Expertise accrues through playful exploration and repetition.
That's not to say you don't have to drill certain things. Professional piano players, professional athletes, professional gamers -- they all wind up doing "boring" drills of the same moves. But the craft isn't all technical all the time, and the endurance to withstand drills is greatly enhanced when you're hooked on playing.