HL2 was the first major game that based its core gameplay to its physics engine, the first to have HDR rendering and the game that Source engine was developed for. Without HL2, a lot of video games in the decade that followed it, would have looked a lot different.

Yeah, maybe so. Source is just Valve’s internal engine, it was continuously developed and used during pretty much all of their FPS-type game development which includes HL2 along with everything else. It was forked from the not-“Source” source tree at the time of release of the original Half-Life and moved forward continuously from there. But yeah HL2 did do a bunch of ground-breaking stuff, I do see your point and I think it belongs on the list.

The article claims that Shenmue was the first to have a “living world” where characters follow their daily routines and so on.

It’s not. Ultima 6 was doing that.

Actually, The Last Express had already done whatever Shenmue was attempting to do with its “living world” absolutely ten times better. But the same tragic story that led The Last Express to be a commercial flop also means that all the wonderful stuff it did didn’t really make any impact. 😢 TL;DR it was an actual successful implementation of powerful narrative inside of a world that the player could meaningfully impact, in a perfectly meshed and groundbreaking form. But for some reason the studio either refused to or couldn’t do basically any promotion for it, and so after being completed it sold barely any copies and simply fell into the abyss, unknown. It was a masterpiece. Shenmue probably had more lasting impact on gaming.

en.wikipedia.org/wiki/The_Last_Express