It's sad old events never get to re-run because of Microtransactions.

[Shistar]

[...] Then raiding is another thing where if you don't do it immediately, all raids will become: "[Duty complete]" as a must. So good luck there.
Farming new fresh items and obtaining them? You better hurry to get them now, or few months later. If you come after 1 year or so, prices will skyrocket and no longer be cheap, thus you missed a chance to buy it at a low price when everybody was playing.

By the same token, you can just wait a little longer and do it yourself unsync. The content isn't going anywhere.
As for the prices, it depends on which items you're talking about... but typically yes, they become more expensive as the majority of players move on the new shiny thing and those who stay behind get to make money by supplying the market. You can do the same, too.

Also why they like to sell stuff "per char" instead of "per account"? How is that fair? When other games offer much more support? Crazy I know.

Apparently there's a limit to the amount of things one account can share across all characters (???) and they've been mostly prioritizing mounts ever since. But I agree they need to take a look at it, they'd be better off in the long run if most items, especially limited items like Matoya's Hat, could be account-wide.

Trying to play with a friend but you just started? Better pay for that MSQ skip.

I will never understand this tbh lol you can still play together...

Doing achievements for new trains, mounts that come from stupid train achievements of kill 2000-5000 S ranks? Better do it at start of expansion or you'll never get it since they remove multiple layers and now it's harder and harder to farm.

I'm not familiar with hunts, what are these layers they're removing that make these achievements harder to farm? As far as I know, trains still happen all the time, no?