Being a solo player means, no Other Players, Hence no Backup.
AKA, Multiplayer Disabled, No Allies, No Outside Help, You vs All.
Better point of reference would be like the Fire walled Haunted Forest with just you and no allies on the Fireteam, where nobody else can show up to help without an Invite.
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It was really a rhetorical question but with that sort of logic then solo players can't do strikes, crucible, public events, etc because then they have teammates.
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True, which is the reason for the Freelance for PVP, and Nightfalls In PVE