You're right, XSPEC is better than stuff like DeepOnion or Verge. The thing is, I would never invest into these last 2 as it's really clear from the very first second that they are bad. It's not so clear and so easy to find from XSPEC, and after I found out some discrepancies, I became doubtful and curious, thus my original post. Just shared my own research, everyone can judge for himself after, I have no interest whatsoever.
jbg said code for 1.4 will be available next week or so (who knows why not now, in a public branch other than master?).
As said, time will tell.