LuckyBancho data shows that FF14 is in decline

[Noumenon]

No, that’s… not how that works.
...
achievements are an accurate representation of playtime

So you picked the least consequential part of OP and laser focused on it and ignored the rest of the discussion? Which is clear because I've already remarked on how LuckyBancho's numbers represents a summary statistic that does not capture huge swathes of the activity distribution.

Actually yes, a comparison can be made between WoW and FF14, because there were other similar trends in WoW that now exist in FF14, like longer patch cycles, more bugs, etc.

And a comparison does not mean that the two trends are identical. It simply means that there is cause for concern. Hence "eerie".

We're not doing any rigorous statistical analysis here. There is not any regression or model or tree or whatever in this entire thread. We're merely discussing the data. And figuring out the context. Something that is currently done in the thread. This process always preceds actual statistical analysis. If this process is unfamiliar to you I don't think you have produced any quality data scientific work in your past.

And the fact that you think I'm conducting statistical analysis reveals a high level of non-understanding. I have not brought forth a single model or regression or MCMC or whatever. Anyone who actually understands statistics knows that I'm not actually conducting any analysis. Again, we're just discussing the data.