The timelines that Tolkien set forth for many of the events in the Second Age are pretty ridiculous. I get that they're supposed to represent the sketch of an epic history, but they are completely unsuitable for adaptation to dramatic medium in their original form. Even if you wanted to make an anthology series where the time jumps happen between episodes, you'd have a lot of very boring episodes for isolated events that are too far removed from the overall stakes.
It took about 300 years from Sauron seducing the smiths of Eregion to when they begin forging the Rings of Power, and then almost 100 years for the rings to be completed, followed by a decade before Sauron completes The One Ring, and then another century before the War of the Elves and Sauron begins, which then lasts for almost 10 years. If you think any sort of dramatic tension could be maintained in a show or movie while trying to depict such vast stretches of time accurately then you're absolutely delusional.
The same goes for the end of Numenor: 80 years of civil war before Ar-Pharazon seizes power, 10 years before Sauron is captured, and another 50 years of him corrupting the Numenoreans, and then another 10 years before the downfall.
The one thing the should could have done (and I don't think it would have made things better) would have been to have each season cover only one set of isolated events (the Rings, the downfall of Numenor, etc). Even still, the timelines would have to be condensed to make for a decent narrative. And of course from a production standpoint you'd have entire casts, props, and sets that would only be used for a single season before being discarded. No, it's definitely better for the show that they take the key events and weave them together into a tighter narrative.