Yes. Except the risk to reward ratio here is not good.
here’s an example:
Roadhog hooks someone. You fade in and save them. Great success right? No because now moira is dead 
She has no escape to retreat and whoever she saved it going to retreat the minute they do.
Situation 2: D.va bomb. You really wanna try time that (with the fade startup included) to save one ally risking two deaths.
You’re reducing her survivability generally here by nerfing her duel potential, escape, and self heal. On top of recent orb changes that made the heal orb faster and less consistent. the risk of fading into danger almost always leaves her with no way out because none of her other cooldowns or abilities can save her. Which now requires another hero to save her. OR she dies. And it’s a life for a different life. Moira, the main healer, does not want to trade her life out.
On top of this Bap can give 5 seconds immortality with greater range, and greater throwing range by not entering danger on a 25s CD and is also a main healer. You would just choose that because regen burst can do orbs job and he has no CD on exo boost AND his immortality doesn’t requrie him to kill himself. AND he can deal MORE dmg at more ranges. Yes moira has her niche advantages but is in no way better than this.
Edit: got blindsighted and forgot to address your other points.
I didn’t know this was how it worked. I thought it was single target. but this orb is useless against hard to hit targets, 1v1s, and many other situations where the other was better.
Is the range still 4m on the orb though because for one person to be 4m of another on the enemy team almost never happens because you can WALK out of this range in less than a second not to mention the person you hit is moving. LET ALONE DRASTIC MOBILITY.