Well, please don't assume. Like the personal message you sent me with regards to Oreck's redesigned bag holder..
Well if there are slots in the upholstery tool as you say, it appears that my assumption about clogging is correct an accurate concern. Releasing the full suction [with open slots] of the wider surface upholstery tool would diminish the clogging potential in the narrow neck dirt opening of the crevice tool.
The only point I think you are referring to is the bag locking/staging bracket on the later models ORECK bags to hold the bag collars securely. Which I must say work well.
Carmine D.