Hey @AE67,
We totally get your frustration with albums being removed from your TIDAL account due to licensing changes. We’re music lovers as well, it’s happened to all of us for as long as there’s been streaming music. My most memorable case of this was with the Super Deluxe Edition of Fresh Cream. The mono mixes of that early Cream stuff is where it’s at! No donut hole in mix there, what a muscular sound! Nope, gone. And not just gone from my streaming either, gone everywhere. It took me months to find a sealed physical copy that didn’t cost as much as a Devialet Phantom.
Music streaming platforms, in general, aren’t very transparent about these licensing changes because they’re also on the receiving end of the whims of the music industry and publishing firms when it comes to this stuff. Sometimes titles are available again after a brief delay, sometimes not. How many streaming services are going to say ‘Subscribe to our service, your favorite music - here one day, maybe gone the next.’ That’s a terrible slogan! 
As Brian mentioned earlier in this thread, figuring out a mechanism to flag these licensing fluctuations would take quite some effort, implementing system wide changes requires a lot of work. In most cases it would be moot, because, licensing rights are frequently restored on releases quickly and without anyone having to lift a finger.
This just isn’t feasible from a metadata approach. The work that has gone into disambiguation and recognizing unique identifiers for different versions of albums is Herculean. We can’t also tell the index that any new ID is also equivalent to any other ID of the same album, but only in cases where licensing has expired on ID A but remains in place on ID B, C, D, If/then restore play counts, tags, and edits on ID B contingent upon…
There’s plenty of customers who wouldn’t want us to do that.
Also, in fairness, the intervening three years have been plenty busy with development work. You, and anyone else reading this has been beneficiary to that work. We have to make choices and prioritize our vision for the product against customer feature requests. Just because something doesn’t happen within a desired timeline doesn’t mean it isn’t a good idea or coming at a later time.
Development decisions are always in flux. There are a lot of things moving through the R&D pipeline, things that you have requested for a while, things you’re going to really like.