David Kimura First of all I should thank you for your videos and for pushing the envelope so the issues can be understood. Also helps to know not to jump into shiny new toys too quickly, particularly since Rails seems to be transitioning.
I have a small app that had sat for a year and then about two years ago I took it up again and decided to update to Rails 6 and Webpacker. Which was probably a mistake (particularly in hind sight).