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Crafting window from alpha1 and the so far explained crafting system is really similar to L2's, except for the dials.
Classes function differently, but the separation of classes is quite close to L2's. I thought about making a video showing some potential similarities, or at least the ones I saw.
Humans/elves/orcs/dwarves - all in L2. Tulnar is the obvious outlier, with Py'Rai coming close second, but tulnar were a kickstarter stretch goal, right? So they would've probably came later in the game's life and not be the base race if Intrepid didn't reach that goal.
Copying lore/world design would be a big oof that would show that they have no idea how to make the game their own. Though open world dungeons and bosses in some rooms and at the very end in a semi-instance (like the volcano dragon from alpha1) is straight out of L2's design book. Now I'm sure that L2 wasn't the first game to use that design, but saying that L2 only inspired pvp is a bit weird imo.
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Iirc L2's design took a lot of inspiration from EQ, but instead of improving on it as how, I imagine, EQ2 did NCsoft probably just copied it, as a ton of other mmos did with WoW's design later on.
Now I could be completely off base with that assumption, but we'd have to have someone here who has played both EQ1 and L2 to draw some parallels.
And as we've seen with WoW and its clones' example, anyone, who tries to copy another game's success and who's not the OG team that made that original game, is destined to fail. Once WoW got newer devs and control from above - it became shit, so you can even fuck up the original game by just changing the team. L2's lead designer left and the game went to shit after that (in the opinion of all the people who still play on the private servers), so even the small good parts that it had went out the window.
Also, I'm pretty sure that L2 took their pvp system from L1 (and added a few things I think), so this is just another parallel that taking mechanics from the previous installation in the series and making them better is the way to. L1 had huge success (still does) with its pvp system being one of the great things about it. L2 took that and made it its own and it was the best part about it. EQ1 had its own cool stuff and I'm sure that EQ2 took those things and made them better and changed for the better.
So your friends pretty much went from a copy with one redeeming point to the "original" with way more improvements to the OG formula. I'd assume people whose first game was some failed WoW clone would have a similar experience if they went to play WoW and saw all the systems that might've been in their first mmo now done much better. Though I dunno if current WoW would really have that effect, but I think you know what I mean.