Not gonna lie that waiting games gets more and more as more music come into existence.
Even about a little over 10 years ago, ZV already mentioned in an interview that the "good riffs" has been taken by bands like Pantera, Metallica, Megadeth, etc., what more now?
It's not really easy to come up with another CoE or self-titled without sounding like something that already existed or something they've written(with the exception of HTTK where they clearly stated that they were paying homage to their inspirations, hence the riffs sound similar to existing songs). It's a matter of cracking something new.
So for me, personally, I don't mind how long it takes, as long as they come up with quality stuff(as they've always had).