You’re taking World of Warcraft as example of how MMOs work, which may cause your confusion.
EVE is different. There is no ‘progression’ line of zones in EVE.
You have progression between zones in WoW where you start in Elwynn forest, progress through Westfall, Duskwood, Stranglethorn Valley all the way to the current ‘end game’ zone. And going back to a previous zone is useless apart from achievements, because all the enemies are underleveled and give no meaningful rewards.
You’re thinking of a themepark game, where players sit in a loop of endless progression. Progress through zone A, B, C all the way to the end. Then to keep people busy in a perpetual loop of ‘progression’, a few new zones and levels are added each expansion to invalidate all the old equipment and invalidate the old zones, so everyone can progress further again!
EVE doesn’t work like that.
Ships are as useful as they were 10 years ago (apart from some buffs and nerfs perhaps) and aren’t invalidated by new tiers upon new tiers each expansion.
Likewise, zones aren’t invalidated by addition of new ‘better’ zones.
EVE is simply a continuous universe with different zones to live in, each zone with their own sets of PvP engagement rules, so that players can pick an area to live in that matches their current preferred gameplay.
Semi-protected by the NPC factions and CONCORD in high security space, or full-out PvP without rules in null sec. Or perhaps you’re looking for small scale PvP with a bigger focus on scanning and less intel from local chat? Or would you like to PvP but not have to deal with bubble mechanics so you can show your superior frigate skills in a multi-billion clone?
EVE has all sorts of zones, and moving from one to another isn’t ‘progression’.