As opposed to the 20,000 Roman sects? the secadventists the latin only group, the prevatican II grouo, the ordain women group, the LGBT loving group, the Jesuits, the Franciscans, etc.... as ebb tide loves to point out all the division in your “one” church”. And it appears gay marriage, abortion, idol worship etc are all sanctioned by the Roman church as priests practice and allow this all the way up to your Pachamama worshipping pope. Hypocrite much?
Not to mention that Rome split from the Eastern Orthodox Church in 1054 AD, in part due to Rome’s insistence that the Pope was the Pontifex Maximus (Supreme Pontiff). The EO never accepted this claim.
So, if schism is bad, why did Rome split from the EO? In part, because it wanted sole ecclesiastical authority over all of Christendom.