I wasn't the one to downvote you, but it might be because if the "Byzantine Catholics'" mentality is "nearly identical" to the Orthodox in the ways you mentioned and identify as "Orthodox", then are they really Catholic?
The theology, culture, and mentalities of Byzantine Catholics -- Ruthenians especially come to mind -- is nearly identical to their schismatic Orthodox counterparts, and will sometimes identify as Orthodox in communion with the Papacy.
Yes, the Byzantine Catholics are Catholic. They share the one Apostolic Faith, possess Apostolic succession (unlike the Novus Ordo where this is an open question), celebrate the seven sacraments (mysteries in their terminology), in communion with the See of Rome.
Is there anything else needed?
Do you have a different definition of Catholic, perhaps "only Roman" equals Catholic?
Have you ever met or interacted with Byzantine Catholics? I live amongst a large population of Eastern Catholics and Eastern Orthodox -- one of the largest concentrations outside Eastern Europe and the Near East. Although as I wrote earlier, the Byzantines are closer to the Orthodox than to Latins, I also pointed out that some Byzantines call themselves "Orthodox
in communion with the Papacy."
THAT makes all the difference.
Have you read the treaties of Brest or Uzghorod? Have you seen what little Rome required of the eastern Churches to enter into communion and be identified in the West as "Catholic"? Have you seen what Rome agreed to on her part?
In COMMUNION with the PAPACY!
I am reminded of a seminary professor at STAS, freshly ordained, who kept rdferring in speech and writing to the Syriac Maronite Catholic Church as the "Marianites". 🤦♂️