Because the Novus Ordo, Indultarians, etc. have abused this point, many trads knee-jerk the opposite direction and care nothing at all for unity.
Everyone does his own thing, even if it doesn't matter.
Whether it's the version of Bible they use, the translations of prayers that they use, the Holy Week they prefer, the Missal they prefer, or anything else.
Do you not see how the Devil is behind this, and he's laughing all the way to Hell?
We've reduced unity to something less than useless, when it's actually quite important. Not as important as the Faith, but it's still important.
How scandalous is it when a non-Catholic observes that Trad A and Trad B don't agree on anything?
What if he were considering becoming a Catholic? He'd never do so, observing how they can't even agree on a Bible translation. He observes that Trad A has the "mainstream" Douay Rheims Challoner revision, Trad B has a Lulu.com paperback of the 1500's Douay Rheims, and Trad C reads only the Vulgate and wears a monocle.
It's a miracle ANYONE is converting to the Faith. The divisions are downright scandalous!
Think about it: You could have 2 serious-minded Trads living 30 minutes apart, and fully compatible personality-wise to be friends. But then you'd have certain things coming between them, basically keeping them from being closer friends. They can't read Scripture together, talk about the Pope, go to Mass together, etc. because one thinks that attending an "Una cuм" Mass is sinful, one of them thinks only the 1500's (non-Challoner) Douay Rheims will do, etc.
There's only one beneficiary of this, and he's red, has two horns, and a pitchfork.