What I heard most often around here and as the single most dominant argument in an older thread of mine, the some people don't want MSI to be raised because it is overpowered in Lockdown.
Don't know that, don't care about Lockdown. But I care about MSI, because I'd really like to get around faster through the ever repeating Clockwork.
So if it is this overpowered in Lockdown, why not make it a PvE only UV?

Let me address one issue right away:
"People pay UVs almost strictly for LD.
Do you think people have max pierce max shock max stun skolvers because electrolisks are too strong? Nope.

While this idea has good intentions and could have worked if it was applied from day 1, doing it now will only cause trouble.
Those that have such things are the ones that maintain the game by buying and selling energy to accesorize their cloned sets and get UVs."
-Little-Juances

MSI is no normally accessable UV, it can't be rolled and usually can't be brought beyond medium (except with Sprites). No one could feel deprived of something he spent hard cash / hundreds of hours farming on.
If MSI is really overpowered in Lockdown, but totally laughable in PVE, this would be a simple way to reverse this to the delight of all involved.

EDIT: I am sorry for my poor wording, it seems I caused some confusion with this.
I am not asking for MSI UV. That, which we have right now on Mercurial Armour, is still considered a UV (at least I never heard any other name for a bonus that's linked with the equipment, but maybe that's just a lack of information on my side).
NEVER should we be able to roll for MSI. This has to stay that way and it is the only way one can argue about excluding MSI from Lockdown: After all, you can not spend money on trying to roll it and feel betrayed you can't use it in Lockdown, if it isn't rollable in the first place.

What I am asking for is simply the standardisation of Movement Speed in Lockdown, regardless of how much MSI you have.