The relic is BiS for some jobs, to some people it's worth the process to get to that. For others, it's not worth it to slam their heads into it. (espesiaclly MCH and maybe DRG). Me personally? I'm so disappointed that a content could be delayed so long but only end up using existing and even old 2.x content. It's the final straw for a lot of people, and the already-low expectations I already had with the content patches continues to dwindle even more. I'm ready to take a (indefinite) break from the game if my raiding static wasn't still together.
Then they either have an entirely backwards thinking, or they need honestly stop sitting behind that excuse. There's absolutely no reason for a piece of content to be delayed and still come out the way it is. Not to mention there was a slide in a Liveletter a long while back where they'd acutally rotate people for designing content, or something along that line. Regardless of who it was, the problem is reoccuring with each and every patch, and it's notorious bad for 3.15's anima quest which was delayed since 3.0 because it wasn't ready (and it does not have the design to show that long of a development time). Even in regards to relic I wasn't expecting something over the top as new encounters and such, but rather for them to stop making 2.x content relevant to 3.x's progression. I'm fine with going back to eastern thanalan to rescue an important NPC from halatali. I'm not fine with going back for 2.x hunts (which for some reason ,rewards more than 3.0 hunts toward the anima quests) or 2.x beast tribes to work on 3.x content.
A principle that takes effect in customer service is that people will wait for good product.. At this point I feel that SE can't afford to pump out subpar or bad content because all it'll do is lower expectations and patience (if you really need to delay something to perfect it down the road), but they've already accomplished that in most people's eyes as early as 3.07
The anima quest (which is the majority, if not entirety of 3.15) was delayed from 3.0 to 3.1 to 3.15. And to be fair, the mid series patches are only really there to add in things like balancing changes, QoL adjustments, or otherwise act as the "second half" of a content patch. Like I mentioned before, SE has set themselves standards in 2.x cycles that they themselves are not meeting now. You can quite honestly look at the patch notes for 3.15 and realize that it's mostly padding because of crafting items and quest objectives from something that should have been in for the release of 3.0, compared to say 2.35 or 2.55