I get being frustrated by changes but this adaptation has to do a hell of a lot more invention to function as a series. The 2nd age in the text was mostly bullet points. A list of 100 Numenorian kings is not a story.
Precisely. The makers of the show only had two options...
1. Stick rigidly to the lore and vast timescales, and therefore only dramatise a couple of paragraphs of Tolkien's LotR pre-history. So the show would be 1% Tolkien and 99% them just making things up to fill in the blank details and fill up a TV show's runtime.
e.g. From the Appendices:
"After a time Sauron made war upon the Númenoreans in Middle Earth, before they should take root. Orodruin burst once more into flame, and was named anew, Mount Doom. But Sauron struck too soon, before his own power was rebuilt, whereas the power of Gil-galad had increased in his absence; and in the Last Alliance that was made against him Sauron was overthrown and the One Ring was taken from him. So ended the Second Age."
That's the whole plot for our show, fill in the rest of the 5-7 seasons yourself guys!
2. Play fast and loose with timescales and make adjustments to the lore, in order to fit in all the LotR backstory stuff we want to see, by telescoping events and lives that took place millennia apart. So the show would be about 80% Tolkien and 20% them making up new bridging material.
Naturally they went with option 2 because 1 wasn't really an option. What would people rather see, 1% Tolkien writing, or 80%? Complain about the show's writing of the dialogue, characterisation choices, casting etc etc by all means but complaining about them not sticking to the lore rigidly is silly and redundant IMO.
By the way, I'm currently driving myself mad by trying to understand how the Silmarillion map, fits next to and scales with the main LotR map. Every attempt I see online seems to have it done differently and have obvious mistakes I can see.
I'm pretty confident about the vertical scale and positioning, and the join across the blue mountains in this rough overlay:
But I'm very unsure about the horizontal scale of the Beleriand map. This Tolkien map suggests that the Beleriand map is drawn 200% to big horizontally: