All have their purpose:
1) race bike;
2) back up race bike (which also has S&S couplers and serves as a travel bike.
3) XC bike for cross, and gravel,
4) TT bike for TT's
5) Fixed gear track bike for track and off season training
6)MTB for mountain biking
7) road tandem
8) back up road tandem (for second home)
9) gravel tandem for gravel races.
I think full on mtb tandem is the N+1
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.