I can understand that opinion. My point of view is different though. For € 99 I got an easier to use VariAudio, at least the announcement of ARA implementation plus Auto Alignement on DAW level (those functions are the most attractive for me in 10). Synchro Arts VocAlign Project 3 is $ 99 alone when on sale. Can’t complain about 10 in this regard.
I remember that 9 to 9.5 gave me more interesting features than 8.5 to 9. Maybe it’s a new habit that .0 versions are more basic that .5 versions 
And as stated, we’re not forced to update at all. It’s possible to work with a combi of OS and DAWs for years without updating but yes - there will be a point when you get stuck. That’s the nature of the beast aka the mythical phantom of technical progress. Not sure if it was necessary to drop 32 bit plugins i.e. (myth) but possibly it was for the sake of not having to implement age old technology that might thwart current developments (phantoms) heading into the future.