Armored Elite does not need anything else, it never needed rework in first place, it just needed buffs to lackluster stuff it got.
Changes just for the sake of changes are bad, thats how Osttruppen ended up with useless supply drop - people thought resource conversion wasnt good enough and "commander needed something else".
Relay is recon ability of this commander, sticking into another commander, especially Overwatch is pointless - that one already has good recon on its own
I would argue that the Sturmtiger still does not fit into the doctrine, you could also see several other people talk about it as well.
All veterancy based and resource conversion abilities were removed because there was no counter play, both for the Ostheer and USF you had insta vet 1 or 2 units on the field, as far as resources go you had an instant boost of a particular resource which was highly abusable, that is why they were either changed or replaced, not because someone complained that Osttruppen needed something else.
And finally, Signal Relay is indeed the "recon" ability of the commander but it's at the same time highly situational.
Some people say that it helps with counter play against the USF, even if so, what if you're not playing against the USF, or what the enemy is smart enough to give it a guess that you will use signal relay if he notices an Elite Armor ability in use to not have an ambulance/major combo setup somewhere just because of it?
Something like Panzer Elite will probably be much more useful and used much more often in the long run against all Armies, and at the same time not be so case specific/situational.