I agree about Palladium armor being useful, but I feel like the higher defense you'd get from Adamantite/Titanium armor would make up the difference since you'll receive less damage anyway. About 13-14 less damage in Master mode. And Titanium/Adamantite provides higher offensive benefits while Crystal Assassin armor provides better movement.Palladium armour may lack in stats, but the set bonus provides really good survivability and it barely takes much mining since Palladium is a pretty common ore. If you're going for Adamantite or Titanium, you can craft a Repeater out of tier 2 or tier 3 Hardmode ores, which will do pretty well against the mech bosses and Queen Slime.
Wings are also needed for the Titanium melee/summoner tank build, or else you won't be able to hit the Twins or the Skeletron Prime with Fetid Baghnakhs for a lot of the battle.
The Ranger Emblem isn't a necessity, it's just a passive accessory that allows you to kill enemies and bosses a bit quicker.
The Magic Quiver isn't that rare, plus Skeleton Archers spawn in the Underground Hallow/Crimson/Corruption, so you might get it while getting Ichor, Crystal Shards or Souls. Not sure about you, but I always get the Magma Stone in Pre-Hardmode while I'm preparing for the WoF.
Mining for Chlorophyte is extremely easy and non-time-consuming, Chlorophyte is literally everywhere in the Underground Jungle.
After Plantera I'd go to the Dungeon for Ectoplasm (to make Pumpkin Moon and Frost Moon summons) and/or Sniper Rifle and/or Tactical Shotgun, as well as some accessories like Paladin's Shield and Rifle Scope, do the Moon events for Chain Gun, Snowman Cannon, or Stake Launcher and Witch's Broom, fight Duke Fishron (after getting Shroomite armour) for Tsunami and Fishron Wings, Empress for Eventide, Empress Wings and Soaring Insignia, and optionally Betsy for Aerial Bane. Then I'd rush to the Pillars.
You have Gelatinous Pillion, you don't need wings. If anything its very fast "acceleration" for a lack of a better term makes it suitable for jumping into Twins and Prime's head to deal chunks of damage. The very short flight time is the only issues, but if that somehow becomes a major issue you can build a platform arena. I did get wings while doing the playthrough for my video for convenience, I didn't treat it like a race or anything.
I disagree with that. Varies on the build and playstyle, but generally if you're rocking an "offensive" build with Ranger and want to deal a lot of damage, the Ranger Emblem Pre-mech is a no brainer option as far as I'm concerned.
Magic Quiver is a 1.25% drop from a somewhat common enemy, while Titan Glove is a 16.67% chance drop from a somewhat rare enemy. It all comes down to RNG. Even though Underground Jungle is the fastest way to farm Mimics or at least close, I remember getting Titan Glove from regular mimics occasionally spawning in Underground crimson.
So is mining for Adamantite/Titanium in that case. Yes, Chlorophyte is easier to find, but blazing through lava layer with Ancient Chisel/Mining Potion/Well Fed is going to get you stacked too.
As for progression Post-Plantera, I find it advantageous for Titanium Facetank since you can rush straight to pillars and come back with Solar Eruption to efficiently decimate everything. Not to mention it goes through walls, so Hardmode easy is a piece of cake in that case. Ranger struggles against Hardmode Dungeon enemies compared to Melee and Summoner and even arguably Mage.