I've only recently started uploading videos to YouTube. I have hours of footage I have yet to upload and edit from an old miniDV camera (I still own one, but haven't used it in years). Of course in recent years many of the vids were shot n an iPhone with the added accessory of olloclip lenses for cellphones. Most of the time I'm very satisfied with the results.
One the other hand I see what YouTuuba is saying. If you're planning on any photography/videography have some redundancy. You don't have to do everything on these wonderful smart phones no matter the quality of the image or video. Something I need to get into the habit of myself as I could shoot pics or video with either my iPhone or my iPad.
Though one thing is true in my case, the reason I do use my iPhone or occasionally my iPad is that often they're readily available. Especially my iPhone as it's usually always on me when out and about. As far as a camcorder especially my miniDV camcorder it's bulky and not as easy to fool with when you realize it's time to record a moment for history. It's not as convenient.
So perhaps I should invest in a camera similar to what YouTuuba uses. That or buy a camcorder more up to speed for 2019. MiniDV camcorders are very aughts and largely obsolete (I probably would have to search far and wide for a miniDV tape. Though memory cards as the one seen in the above video are currently readily available to consumers.