MSI is an excellent stat but it doesn't change very much about the fundamental balance of the game. If anything it makes strafing with guns while shooting and dropping bombs somewhat safer. OP does not use bombs or guns that strafe outside of polaris. In this case, MSI will help them get to where they will stand 100% still unleashing a charge or slashing something, not utilizing their 8-9% speed increase.

For them it will help retreat after they've attacked and get into position faster to unleash another charge of some sort. E.G. A lumber is reving up to attack them while they unleash their grim repeater charge, they finish the charge faster using ASI from UVs and/or swiftstrike (assuming they're still using that) and are then able to step forwards to dodge. They proceed to get another full charge with their CTR UV and kill the lumber.

I still don't understand what you want. Are you asking us to configure your items into loadouts for particular missions and strata? There are too many. Which ones?