Usually not necessary with diameters that small.. When you get up past 15mm it really isn't as practical to work off of the end of the whole tube.
Smaller dia. handle(s) to turn with = better control and managability. The narrowed ends of a point also create a pre-necked configuration that allows you to more precicely shape the glass between the points. Eg. blowing a perfect sphere between point handles is ideal, where as doing it on the end or middle of large diameter tube is going to create several problems and limit the results.
In my world just about every blown piece starts with a pulled point. The only thing that comes to mind that doesn't is a coil-potted bead that gets coiled from the end of a 9-12mm tube.
In some situations like heavier blown pieces that may exceed the strength of a pulled point, it's applicable to attach smaller tube to a section of larger tube for use as a blowtube/handle.
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