Why keep PDBs?

what's the point of distributing PDB files via SMM? they shouldn't be useful to the end player and only add unnecessary weight to the game files (the problem is amplified on servers).

Just to give an example, by removing them, on my server I go from 1.5GB to just over 100MB.

am I missing something? are PDB files also useful to the end player as well as the developer in the debugging phase?
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