I am for uSync and Translation Manager, but its mainly because we have built that expectation (espeically with uSync) that we have a version = version release .
uSync v12 - Is using one feature that is new in v12, but we could have multi-targeted to get it.
if i could start again 🙂 - i would have uSync v10 and TM v10 work on v10-12 and then we would version at Umbraco LTS only.