Yes, I think you've missed the fact that there are TWO versions of Lightroom now available when using a subscription plan. There is "Lightroom", which stores your images in the Adobe Cloud....this was a new product released in 2017 and does not yet contain all the functions that you were used to in Lightroom 6. The other product is called "Lightroom Classic", which in fact is the upgraded and updated version of the Lightroom 6 perpetual license version that you were using. As such, Lightroom Classic has all the features that you are used to, plus a heck of a lot more functionality has been added since.
I would suggest, therefore, that you should switch to Lightroom Classic if you want to retain all those functions that are missing in Lightroom.