I have asked countless times, even tried petitions etc…
never any answer.

Waldorf, Access, Novation, Roland, to name just a few, all have swinging arps.
I could extend the list but really, most of them do.

I’m on holidays at the moment, but I can do a short video with all my sequencers that swing arps when I’m back in London.

Besides, what other synths do or don’t do should not matter. A world class sequencer should let all automated sequences follow the global swing setting, period.