Revamped Pyramids: Make it so at least one pyramid is guaranteed to spawn in a world, and make the interior bigger and more trap-filled. Maybe add some of the new mechanisms introduced in 1.3.1. Some of the old pyramid loot could be added to regular chests in the desert and swapped out for shiny new stuff.
Deserts were nicely expanded upon in the last year, but they're not quite there yet, so I agree. I haven't seen many pyramids in my Terraria time, and when I do, I visit them once and never come back because they're no longer relevant. The Flying Carpet/Sandstorm in a Bottle are really nice accessories, but they're among the rarest to obtain. Probably for good reason though, as they're highly useful...
More pre-hardmode summons: Maybe one of the new desert items can be a Scarab Staff that summons attack beetles. Summoning could really use some more early items that are easier to get than the Slime Staff.
While some Summoners can get along just fine with the holy trinity of pre-hardmode, a weak earlygame minion would help a lot, as opposed to hoping I get lucky and find a Slime Statue at the beginning of the game. With the high abundance of Antlions as of 1.3, you would expect there to be more recipes with Antlion Mandibles. But surprise, not a single one. Why don't we introduce an Antlion Staff that does equal or less damage than the Baby Slime, and summons a small Antlion Charger to headbutt nearby enemies? Or a weak stationary Antlion that spits fabricated sand blocks for a short amount of time.
Hardmode throwing items/armor: If throwing items are meant to be subsumed by melee in hardmode, then why even add a new damage type? Things like crystal knives/javelins would help flesh out the throwing class more. Maybe introduce dual-type damage and make boomerangs/thrown melee weapons deal either melee or thrown damage.
The amount of Thrower suggestions on this forum is ever-growing, and rightfully so. At this point, since so many melee/ranged/throwing weapons feel similar, dual-type damage would be something to look into. I'm not sure if it's possible to implement this, but it would be the biggest solution to weapons like the Daybreak and Shadowflame Knife being considered just melee damage and not throwing as well.
The thing is that making a new throwing class would pretty much make them make a new lunar event boss, and I don't think they'd like to change the lunar event a lot.
Also, a throwing emblem and all that jazz, etc.
A new pillar would not only be a lot of hard work, but it would also make the events more tedious for players who regularly grind them. If a Thrower pillar was added, it would probably be white/yellow and based off of comets, because yes. But I think the most simple solution is to make throwing weapons made of all the existing fragments, each with their own effects. The endgame armor would simply be plain Luminite armor, maybe. Giving Throwers an interesting change in path of gameplay kinda like the Summoner has.
IMO they should at least add in the Jungle mimic already.
Definitely. Let's have the Jungle Mimic drop some ancient tools/mechanisms, akin to those seen in the Lihzahrd temple. Something to compliment the new wiring stuff. Or maybe a summon/throwing weapon since those are kinda needed cx