so i have heard that the modern high end pen makers have these nib units(a basically sealed housing containing the nib and feed) to keep the nib and feed aligned and held in place better, IE: a better writer. this is especially true of the more high end pens. a fellow fountain pen guy told me that it was just a scam to keep competitors nibs out of their pens, so in turn you have to purchase a proprietary replacement nib from the original pen manufacturer. any opinions on this? And does anyone know of any modern high end pens that use friction fit nib/feed assembly's???