The following is my current running shoe rotation, and what I use them all for.
Adidas Adios 4 Long runs, Fast/long, Tempo/Threshold, VO2max, speed work, rain/snow, most racing distances, time trials. Everything, it seems.
Adidas Boston 8 Long/medium-long
Brooks Ghost 12 Easy, Recovery, LSD
Hoka One One Clifton 1 Who knows
Hoka One One Speedgoat 3 Soft trails, long trail runs, snow/ice
Inov-8 Trailroc 285 Rocky, technical trails, snow/ice
New Balance FuelCell Propel Easy, Recovery, LSD
Nike Streak LT4
Nike Vaporfly NEXT% Road racing 10K and up
Saucony A8 Road racing 10K and under, VO2max, speed work
Saucony Havok XC2 Cross Country, short trail races, hill work
Saucony Kinvara 10 Fast/long, Tempo/Threshold, VO2max