There are item combos you can easily use on any character.
1. Amulet of Misty Step + Watersparkers boots + Rain Dancer + The Sparkswall. Teleport into the fray -> Cast CW -> 4d4 electric aoe + 3 charges next turn.
2. Boots of Speed + Fleetfingers. BA Dash -> Free jump.
3. Chain of Liberation + Haste Helm. 3 turns of momentum from the helm equals 2 sprints total from the chainmail -> great mobility for shorties, great kiting for ranged.
4. Speedy Lightfeet + Fleetfingers + Hamahraft. Dash -> Free Jump for 1d4+1 AOE -> BA Jump for 1d4+1 -> 2 charges for the next turn.
You just described some game that no one would recognize as D&D.
I guess you could even say that no one would recognize this as being part of a cRPG...
It feels a lot more like MMO / Hack & Slash.
I wish items would enhance MY character build rather than building them themselves.