Yes, the Kodak pin system was primitive. The dominant graphics brand here was Olec-Stoesser - various custom mixes of oval and round pins as specifically requested. Same with Ternes-Burton. But for ordinary film it was Condit. Taping a leader - something I have done countless times myself, is not as precise for direct enlarging purposes - it introduces even more expansion/contraction variables
It isn't just about time saving. Over time, with repeat print orders potentially years apart, you might need to remove old failing tape, clean the residue, retape, maybe re-punch too. If the film original was on dimensionally unstable acetate base, or acetate tape was involved, expect a big headache. It's not like a print-shop run with a concise project schedule.
And for best results, every component of a pin-registered system aligns best if ordered at the same time. That was especially important as machining advanced over the decades. Later Condit was far better made than the early stuff,
but people still dropped early pin glasses, and needed replacements. Even the diameter of the micropins changed a little. Get into precision duplicates using multiple registration steps, and you lose the wiggle room of "unsharp" mask or dye transfer dye-bleeding, with darn little room for error - especially on exceptionally crisp repro media like Cibachrome or Fujiflex Supergloss.
On another note, I have only seen the internal colorhead components, including filter banks, as well as the housings and feedback mechanism, of the Durst additive system. The enlargers themselves were held in a dedicated high-security NSA facility where no form of digital imaging was allowed whatsoever. The point was to have high detail 9X9 true-color U2 shots enlarged big, so that military analysts could quickly adjudicate certain things INTUITIVELY. It wasn't mapping per se, nor composite imagery. The objective was as accurate natural color along with high detail as possible via overflight. That would allow commanders how to best inform the specialists where to further look. This much I know.
Since the maintenance frequency was high due to all the heat, my own brain got picked because I came up with a cooler way of doing the same thing. But that ran counter to the income interests of those holding the maintenance contract, and the Govt has a lot of money, so why bother?
What I don't know is who made the actual enlargers themselves, which were no doubt highly complex machines based on an almost unlimited budget. Nor do I know what happened to all that specialized gear. Replacement parts ran out, the U2 program was cancelled, satellite imagery improved, and now you've got things like Lidar. Still, there's nothing quite like a highly detailed film view. In my own days of geological and archaeological mapmaking, even old 1930's fly-over stereoscope black and white shots showed detail way better than anything Google Earth style today.
And as always, it's a treat to discuss these kinds of things with you, Lachlan, due to your own obvious expertise, even if there is a certain amount of debate on specifics.