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Deep Learning Specialization on Coursera: You can follow the lectures for free or apply for a scholarship if you can't afford it. Even though some content is a bit old, still a very extensive source from fundamental concepts of machine learning to advanced optimization concepts and additional courses on CNN's and Sequence models.
Also, there are several ...
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https://youtu.be/rfscVS0vtbw - Python basics
https://youtube.com/playlist?list=PLZoTAELRMXVPBTrWtJkn3wWQxZkmTXGwe - Full Machine learning tutorials
https://youtu.be/xxpc-HPKN28 - Statistics needed for Data Science
TBH this is all you need to get to an intermediate level.
PS: This only includes traditional machine learning. The op did not mention NLP/DL ...
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For "why", I think it's just a new transformer that maybe didn't get thoroughly thought-out. The default of "half the features" in particular seems very odd to me.
A middle ground, that I think is more useful, is to select features until there is no (or little) further improvement. That's being implemented in PR20145. If they would ...
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