Yeah that would make more sense. You can keep the 0.72 ads sensitivity if you prefer it to slow down by an arbitrary amount.
If you are converting from another game, ADS will not be 1.00, only because the hipfire sensitivity is rounded to 2 decimals, which results in a poor conversion. Since ADS is a multiplier for the hipfire sensitivity, it can achieve a more precise result with less discrepancy, that is the only reason why ADS may result in 0.98 or something.