One of the main draws of M&B and cRPG for me was historical accuracy and it's probably the same for some other people too. Some people thought that it looked silly but the old stab animation was historically accurate, portrayed in German and Italian fencing manuals as an upper thrusting guard. There was also a lower thrusting guard that was similar to the new animation. I don't know if you've researched historical martial arts at all but imo it would be very nice if you did at least in this case.
There was too much wrong with the old anim to fix tbh.
It was about 7 frames of pure weirdness (take a look in the brf, commonres folder outside of modules, skeletons.brf iirc frame 500ish).
Not to say the Ochs guard position isn't realistic, there is a realistic animation of the ochs stab.
However, it's shorter, as a result was pretty much instant and required a huge amount of turning. (It was used in crpg briefly iirc, Papa lazarou's animations for ref)
It's not possible to keep the length of the old 2h stab without keeping the stretching and arms passing through each other. (or having the character fall flat on his face)
For references for the one I made, I don't have any. It's pretty much all guess work and biomech.