El Chaba
I can give an example of what you are talking about. A friend who used to ride 20,000+ a year and thus not normally employed used to have a sewup repair service. Each fall he would get a crate of 50-100 flat tires from Jim Ochowicz. Tires with magic marker saying 'Hampsten', 'Dag-Otto', 'Phinney', etc. The patchies were for winter training and for giveaway to locals around Delafield. One year the tires came in with odd gluing. Just patches of glue between spoke holes. 32-hole rims would have eight patches of glue, 28-hole rims would have seven patches of glue. Usually, not always, there would be glue either side of the valve stem. And a lot of blank space where neither tire or rim had ever seen any glue. This went on for three seasons. This was the days of red glue and there was no mistaking what was going on.
Please no one imitate the old 7-11 team. Not recommended. But any glue job is going to work. Perfection is not required. The only reason to strive for perfection is, as you say, a fully bonded tire will roll faster.