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Is this because you're using a smart trainer
Even simple manually adjustable magnetically braked turbos can provide about 4:1 range of power without changing speed. If you're prepared to lift your cadence for sprint efforts (hmm, a bit like you do on an actual bicycle...) you don't even need adjustable resistance.
gbj_tester-
Not all turbos have remote adjustability. You might also want to do low power/high cadence or high power/low cadence.
I had a magnetic turbo which didn't have remote adjustment and now a fluid turbo - both require gear change for various sessions. Just need to make sure your turbo can do what you want without changing gear. Or get rollers.
JamesQGM
Is this because you're using a smart trainer, because otherwise you will probably want to change gear. Even with a smart trainer you might want to change gear for certain workouts (such as FTP tests where the trainer won't be in erg mode)