When your SHP % decreases, at certain stages it will also decrease your power regen, shield regen, and your total thrust (see config).
The power regen and shield regen debuffs still work, it doesn't for thrust.
How to reproduce:
- put thrust modules on a ship
- do /entity_set_structure_hp_percent on 0.7
- check if thrust went down in build mode info panel (I checked actual acceleration too, no change)
- it didn't decrease