In between 2017 and now, the number of NMD & UB drops have tripled to what was done in 2016. Back in those days, NMD was sold out faster than you can spell it.
UB was riding on kanyehype and the yzy line. Adidas kept the distribution low to an extent. People were going apesh*t over GR releases. Looking back one can recall with wonder...should they stick with that same formula? With more colors, repeat colors and more patterns dropping as months came by adidas just kept on pushing new boost shoes (all the NMD variants), the supply has exceeded the demand. People can now easily walk in and get off the shelf...or even have the luxury of choosing still. 2 years ago that could not be fathomed..
However now they seemed to have toned it down. When was the last time a boost NMD dropped and was pushed? All the marketing $$$ went into the new silhouettes..but those didn't take off as much as NMD did back then. It's a double edge knife. People get's spoiled by boost...to the extent whatever doesn't come with Boost MUST not be comfortable. As you have mentioned none of the new models adidas released even touch on the success of NMD back then. But, more and more people are getting exposed to Boost and that is where the money is. Adidas will continue to innovate...and that is why they are no Swoosh.