Is it getting harder for tanks?

[Kurando]

snip .

Yeah definitely, although in Light Party content if everyone has to burn though Diversion/Lucid etc (and have them stuck on cd) to get rid of aggro and the tank still can't maintain the aggro then something is really wrong in that instance. Most occasions the party works in sync and avoids those issues, but there is always one party matched up at some point that ends up with the above.