I am an EU citizen and I'm travelling with my wife (non-EU, not Annex II). She got a 2 year multiple-entry visa as EU family, and this is already the 3rd time that we enter/exit Schengen since getting it (in the past she also held an EU residence card, but we're now not resident in the EU anymore).
This time, something weird happened: upon exiting Italy: I queued in the all-passports queue with my wife (the only EU queue uses automated passport checks, which my wife cannot use) and presented our passports (together) to the border guard.
They immediately reacted saying that I should go to the automated passport checks. I explained that I was travelling with my wife, and I thought that would satisfy them, but instead they returned my passport, instructed me to go to the automated checks, and when I told them that I'd at least wait for my wife to get through passport check before leaving her, they also seemed quite aggravated (and I thus stepped away a couple of meters back).
To clarify: this is not because passport control was crowded, but on the contrary: there was no-one else in the queue. One more detail: police in this airport often defaults to speaking Italian and do minimal efforts to communicate in English, my wife's knowledge of Italian is rudimentary, which is an additional reason for why I prefer to be nearby to help her.
I know that, if there's an EU passports queue, my wife has a right to queue there, but indeed I suspect that there might not be a right for me not to use the automated passport gates, if I am so instructed by border guards.
But still, I am a bit surprised that this could happen, as from the same stackexchange question:
the chance that she would have to explain herself or would even be refused entry are much higher if she enters on her own without the benefits of your freedom of movement rights. While not impossible, establishing that her earlier stay really was covered by freedom of movement rules is also more complicated if you are not present to show your passport and assert your citizenship.
arguably, this is not much of a problem when exiting Europe (as compared to entering), but it still feels a bit shocking that the rules would allow to split families for what is, apparently, no good reason.