I have done sound at meetings, Circuit and Convention level since I was 12 ... I have installed sound in more KH's than I can remember. We have, on occasion, worked with a congregation that had a remote mic stand. They were not part of the sound equipment recommended from by the Branch, but they were not prohibited, either.
Here is what I discovered over the years:
Remote mic stands
While convenient, are not very common and seldom used at the Circuit and District/Regional level
Since they are usually operated by the sound operator from the location of the sound desk, they are not always positioned at the proper height since person adjusting it cannot always see the end of the mic clearly and at the right angle
Cordless ones are not always kept charged and fail during the meeting
Corded ones have too much excess cord to drag around if the mic has to be moved
Gooseneck mics
While it makes it somewhat easy for the speaker to adjust his own mic, many brother push them too far away
They tend to squeak and creek when adjusted, especially if the mic is turned up
If they are fastened to the lectern, they often get in the way of the speakers notes, Bible and devices
Likewise. if fastened to the lectern, they pick up the rustling sound of the papers and thudding of any movement the brother makes
Most ne KH's and major remodels where the sound equipment is replaced that I have worked on opted for conventional quick-adjust mic stands