Why is Water Hazard so Long? | Half Life 2

Some edited gameplay of the first two or so hours of Half Life 2, which was mostly taken up by Water Hazard.
I won't say Water Hazard is the Surface Tension of Half Life 2, but it's pretty close.
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Music used (in order)
Klaxon Beat - Half Life
Kichijoji - Shin Megami Tensei (SNES)
Gravity - Cave Story
Sky Phase - Gumshoe (Arcade)
Heroic Assault - Spiderman: Maximum Carnage (SNES)
Thrash Machine - Deltarune Ch. 1
DSI Shop Music
Going Down the Fast way - Rise of the Triad
Final Boss - Virtual Boy Wario Land
Scrap Brain Zone - Sonic the Hedgehog (SMS) (FM Synth mod)

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i really really felt bad for this guy. that he took effort on this video and explaining and there is no enough views.