[Frank Lee]

The clutch vs neutral thing has been debated for decades. Many decades.

In cars I have the following opinion: holding the clutch means that throw-out bearing is working against the spring loading of the clutch pressure plate. That is a considerable force. Putting the trans in neutral means some things are spinning and some things aren't, but nothing is under any real loading. Therefore I like going into neutral best.

It's different on a bike. Depending on the bike, it can be somewhat difficult to get neutral, especially from cruise speed. I've done it. The trans sounds "clashy" or "crashy" on the downshifts unless you are going slow. I don't think it's a healthy sound. I no longer try to do that unless I'm going relatively slow anyway.

Then there is the holding the clutch thing. All I've referenced above regarding that holds true for bikes; in addition, you have to hold it with your hand. Depending on how long/frequent the glides are, that can become onerous.

On a bike I'd suggest simply regulating your "glide" as well as you can with just the throttle. Not as good as a car, but oh well, that's what we have to work with unless you are ambitious enough to fit a freewheel system.