This is part of a larger issue that I have with Discovery's 32nd century setting, which is – between ENT, TOS, and TNG, there is a mostly consistent trend of starship speeds being shown to have roughly quadrupled every 100 years or so.
The NX-01 tops out at warp 5.2 (old scale) – 140c
The 1701 tops out at warp 8 (old scale) – 512c
The 1701-D tops out at warp 9.6 (TNG scale) – 1909c
By 3190, the speed of starships should be in the region of 130,000,000c. Whether they're using incredibly powerful conventional warp drives, or quantum slipstream drives, or someone finally got the Excelsior's transwarp drive to work, that's in line with the rate of technical advancement we see across all the other Trek series. And yet they still seem to be pottering around using conventional warp drive running at conventional 24th century warp speeds. It's the almost complete technological stagnation lasting for centuries even before the Burn that bothers me.