That number (3450fps) comes from Hornaday's reloading data for a 24" barrel and is relatively conservative according to their data. Hornaday's data has it going up to 3600 fps with RL-26, and 3550 with several powders.
Vihtavuori's data is a lot more conservative, but they don't actually list the 75gr ELD for some reason. They go straight from the 70gr Nosler RDF to the 77gr Scenar and Match King.
https://www.vihtavuori.com/reloading-data/rifle-reloading/?cartridge=110
Peterson's data is somewhere in between. They have a couple of powders that put the 75gr ELD at around 3450 fps, but I don't see a barrel length listed so I'm assuming its a 24".
Peterson Cartridge | Match-Grade Brass Rifle Casings
American-made brass rifle casings designed by, and for, long-distance shooters and reloaders.
I have no experience with this cartridge so I'm just using data that I can find as a reference point. At first I thought it seemed odd that Hornady was giving such high numbers. Then I realized they were just trying to advertise for their new cartridge. After all, they are still saying that a 22 ARC shoots as flat as a 22-250...
I can certainly understand the recoil advantage that the big 20s have. At a lower cost (probably not that important to most people trying to hit a water bottle at +1000 yds), and better wind deflection, it would just be a question of personal preference based on the priorities of the individual shooter.
To add another variable to the discussion, Hornady lists the velocity for the 62gr ELD-VT at 3850! If that were actually true, it would only have 18.64 MOA of elevation at 1k, and 7.49 MOA of wind (I left mine data at sea level for the sake of easy and consistent comparison so the 75gr had 19.07 moa of elevation and 6.47 moa of wind at 1k). A more realistic number for the 62gr is probably around 3550 fps which have 22.61 moa of elevation and 8.43 moa of wind which isn't nearly as impressive.
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