Questions regarding "old" content

[Sagittarian]

The Wondrous Tails (Tails instead of Tales.. no clue why)

Because it's a Miqo'te child who gives you the books so they are being cute?

As to the OP, the Crystal Tower raids are done more than the Binding Coils of Bahamut. Partially because there are only 3 levels of Crystal Tower and 13 coils. You will find people doing the "key" coils - 5, 9, 12, and 13 - but not the rest so much. Party finder is the best approach for coil (and people will want to do it unsynced [lvl 60] to make it easier) but you can probably get into Crystal Tower through the duty finder.
Once you get to 50 and are gearing, I'd start with Crystal Tower because it is more forgiving (more people).

[DadFynal]

Hey, thanks for all the replies! This is really helpful! So as far as "outdated" content there is...CT, Coil, and what else? Anything else worth seeing for story or Final Fantasy Fan dad nostalgia sake?

[Sagittarian]

Hey, thanks for all the replies! This is really helpful! So as far as "outdated" content there is...CT, Coil, and what else? Anything else worth seeing for story or Final Fantasy Fan dad nostalgia sake?

Most of the level 50 dungeons aren't run anymore except in the 50 roulette by people needing tomestones. Some of them have bits of side story associated with them (like the history of Mistbeard) but CT and Coil are the big ones.

[Niwashi]

Anything else worth seeing for story or Final Fantasy Fan dad nostalgia sake?

Apart from raids, there are a couple side-story quest chains that story-driven players may like. The moogle delivery quests are all about learning some background lore. And if you want a bit of comic relief, Hildibrand is quite popular.