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Look it up, Valve makes different versions of the Source engine.
Half-Life 2 uses a single-player version, and Portal 1 uses a mod on that. Portal 2 entirely rewrites portions of the engine to work better with portals. Left4Dead uses an entire branch on the system, since it's multiplayer but with bots, which kinda breaks their ideas about multiplayer. TF2, CS:S, and Half-Life 2: Deathmatch use a multiplayer version of the engine that relies on a server-type system to keep the map running.
https://developer.valvesoftware.com/wiki/Category:Engine_branches
Valve has different games that have different needs, and it would be quite a biut more difficult if they forced the single-player engine of HL2 to work for a multi-player game like TF2, and vice versa.