Odie,
I understand what your saying but when you reach for another tool you are breaking the flow a bit anyway. In addition when you reach for another tooled handle so often you either grab the wrong one or something falls because of the storage issues. I personally love the ER type handles because you can use one handle that you are accustomed to for all of your 3/4", 5/8", 1/2" and etc. Not only that but you simply remove the dull tool one and pop a sharp tool in and keep working which takes maybe 5 seconds longer than just picking up a new tool and going. The storage issue with so many tooled handles becomes an issue, a tool without a handle store much easier. Sharpening tools without handles is so much quicker and easier as well. The other advantage is, at least with hollow tubes as a handle, is you can easily adjust the length of the projection to fit a particular cut. Sometimes the tool projecting to far out or to close to the feral can become an issue on certain cuts. So can sharpening a tool when is short and to close to the feral. So many more advantages to collet handles versus dedicated handles. They may not be for everyone but for me they are one of the best things for wood turning since round bar stock started being used for bowl gouges.
What I did not understand in the video is whether or not Brent is making an ER25 and ER16 collet holder for handles. The smaller ones like Kelton's are great for the different size gouges. I have an ER32 for my 3/4" gouges (roughing), ER25 for both 5/8" and 1/2" gouges and ER 16 for my 1/2", 3/8" and 1/4" gouges. The handles are all different lengths to accommodate the different diameter sized gouges. The handles also have removable extensions for them if I need them a bit longer/shorter for an application. I am going on and on here so I guess you get the picture that I love them. So versatile.