One thought, let's say you have a very complicated application (think ERP) and you have an onboarding wizard. This can take some companies a long time to complete and things need to happen in a certain order. As some stages are completed, a lot of background API calls are made and data is synchronized. Using State Machines may be a viable solution in these kinds of scenarios.

 ☒ There shouldn't be anything to modify per say, but depending on what you're building, you may want to wrap it in a gem.

https://guides.rubygems.org/gems-with-extensions/

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 ☒ I would say that it’s possible. SoundWave gives enough flexibility with its APIs but is somewhat limited on the customization. For a true customization, Howler is pretty powerful. However, you would basically be building your own custom UI for it.

https://howlerjs.com/

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I did run into an issue recently where the quality selector no longer worked. I ended up having to do this.

import contribQualityLevels from 'videojs-contrib-quality-levels'

videojs.registerPlugin('qualityLevels', contribQualityLevels)

☒ It's the Microsoft Whiteboard on iOS. I screen captured that part on an iPad.