Can someone remind me why this is such a screaming issue?
If one figures the Bible alone is the source for salvation (which borders on idolotry of the Bible) then one must assume that only an uncorrupt version of the Bible can advise on an uncorrupt path to salvation.
Conversly if one beleives that teh church Christ gave the keys to bind and loose is under the guidance of the Holy Spirit Christ promised to send and thereefore can clarify the truth to correct human errors it becomes somewhat irrelevant.
It's not screaming it's alarming. Your western Bible is based on Hebrew OT, while the NT is chock-full of Septuagint-based OT quotes. As you probably surmized, the Apostles used LXX; Luther decided it was the Hebrew text that was 'more better.' But, then again, that was not the only thing Luther didn't get right.
IOW: we ain't readin' the same Bible, got it?