Nancy you wrote "CS6 can't hold a candle to modern Photoshop CC. Setting aside the fact that CS6 is discontinued, unsupported and no longer receives any updates, it's 8+ years behind in technologies. I could never go back to CS6 and be happy."
I do not work by candle light so I could easily go back to CS6 for CS6 is stable a great version of Photoshop and does not have all the new Bugs Adobe has added to Photoshop since CS6. Every new update contains bugs that interfere with users work. Using Creative Cloud Photoshop is not a good user experience IMO.
I will admit the new tools were add and some old tools have been improved but I have also been impacted by new Bugs. So is Photoshop 2020 really better than old version of Photoshop can be a matter of opinion. The Video you posted start off with the new Remove Background button. I have an old 2004 background removal PSD I did using Photoshop CS a very old 32 bit Photoshop version. Is Photoshop 2020 removal better than my CS version's removal. Old version of Photoshop work well. While new automated tools are helpful they do not get the job done they get you started. CS vs PS2020

JJMack