I also don't agree. Performance and speed depend on how a program is designed to utilize memory. Performance to me, is not just speed, but capability. To negate the possibility that SU can't provide more capability going to a 64 bit format would be unfortunate. I think we will all look back some day and laugh at the days of 32 bit programming.
What about animation export? Or high res .jpeg export? Why wouldn't processes like these work faster, similar to the benefits 64 bit processing provides other render engines? Same would go for LO.