I would argue quite the opposite.
Generally speaking end-game pve content requires certain level of organization from the players, but it barely provides any tools for that (of course there is "FC topic" and lodestone "fc forum", but functionality is very limited and not very convenient).
Are you really suggesting that every FC should have a website, and on top of that a dedicated web developoer? Are you arguing that every FC building their own tools, is more reasonable than SE doing it once, and providing us with universal tool for all FCs to use? If this is almost a requirement for end-game - it's only logical to have it, in the game.
WoW had ingame calendar for years, tbh when moving on from wow, I couldn't imagine any new mmorpg would not have it, because it was such an important tool, sadly I was proven wrong too many times.
