I think what a lot of people forget is in season 5-7 our only souces of movement speed were in runes (none of the AP jgs took quints of MS), and that wanderer mastery (which gave 3% MS at rank 5). Runic echoes added to this in season 6-7.
In season 8 we have: Relentless hunter (8-48 free MS) Celerity (3%), Waterwalking (25 in river), and in Elise's case we got our 5 MS back, and then we have items which may or may never be used that give MS (shuralyas, twin, spellbinder).
Personally I prefer my 5 MS in general back on Elise and we do have a lot of speed in the game at the moment. The all or nothing mobis meta got stale for me.
I think they should atleast give 5 MS to nid, eve, and diana. Maybe even replace the sapphire crystal with an amp tome entirely.