Apparently less than 3 years for a comparable amount of content to terraria updates that took a similar amount of time, if not longer, is an eternity

Even deltarune chapter 2 is over a year older than the current terraria patch, and we got far less communication about the upcoming chapters 3 and 4 during that time compared to 1.4.5. The Terraria community is very impatient. Usually indie games with long waits like this don't have the luxury of being insanely replayable sandbox games, and the devs are far less transparent about it too.
But nah, just because the devs don't tell us everything about everything they do every month and want to withold information about what they're working on so we can discover it ourselves later, people just love to say they're "giving us monthly nothingburgers" and "a terrible example of scope creep". It's already exceptional for a game dev (even if you're including other indie devs with absolutely stellar reputations) to give us progress updates of any kind in the first place, let alone ones as frequent as monthly, not sure why we're demanding more.