I agree, but haven't tried scootering with my group yet.
I am also the photographer of my group so us having the strobes would defiantly help me feel better about putting some distance between us for a photo or video clip and then being to easily regroup and continue.
If you can see them to photo or video them, you don't need a strobe...
In case you are not aware, strobes do have some downsides.
The BAF in particular is BRIGHT. It is legit annoying to be anywhere near it when it is turned on. If the water is turbid, it's even worse. It lights up all the particulate around it every time it flashes and makes it really hard to see anything. Think, the same idea why you want a really tight beam on your flashlight when you're in turbid water.
Following somebody that has a bright strobe flashing away in front of you sounds really annoying. And if it's not bright, is it useful at all?
If visibility is kinda low, that likely means the water is turbid. As mentioned, a strobe lights up all the particulate, making it hard to see anything else.
If you think you would need a strobe to keep track of each other, maybe you just all need good lights that you keep turned on during the whole dive? Lights with a nice, tight beam.
It IS true that scootering in low-ish viz makes it really easy to get separated. I am not sure that hanging a strobe on your butt is a good way to address that.
The most common way to get separated in that situation - in MY experience - is that everyone is ready to go, the leader takes off, and it turns out somebody's scooter doesn't start or they weren't paying attention or whatever. The leader goes for just 2 or 3 seconds (or longer) thinking everyone is going with them, realizes they are not all there, and then... can't find their buddy(s) again.
Having a strobe on your butt is probably not going to be much help for your leader to find you again after that.
Having good, strong, tight beams on lights means you should be shining your light ahead of the leader, and the leader can see your spot on the ground (or wherever) in front(-ish) of them to tell them that you are there behind them. Just like swimming without a scooter. In a group of 3, the middle guy is watching the spot of the guy behind him, too. If there are more than 3, then you split up into groups of 2 and/or 3.
If the leader starts to go and immediately loses sight of your spot beam, they know to stop immediately and flip a 180.