George, I can’t understand why you still hold on to the misconception that all swords polished until 1945 were done in Sashikomi. Although Sashikomi is indeed the earlier form of (final) polishing, Hadori was used at least from the mid-Edo period on according to old records, and possibly even earlier. However, the care that is exercised in doing Hadori as we know it now, and the level of whitening of the Hamon / Hataraki, as well as the degree of darkening of the Jihada trough Nugui, is something that came with the advent of the light bulb. Electricity didn't only enable the polisher to work with a constant, bright source of light, but makes it easier to see the various Hataraki clearly, and the Honami family responded to the call of connoisseurs to refine their techniques in accordance with the improved conditions of appreciating swords. No conspiracy, no brainwashing. The light bulb, btw, was introduced to Japan well before 1952 .
If we follow your reasoning, and Sashikomi is better because it preceded Hadori, and therefore is the more traditional method, we should collect pre-Edo swords only in Shiratogi, i.e. not going beyond the Komanagura stone; actually, there wouldn’t be much to look at at all .
Another reason for believing Sashikomi is more traditional could be a misunderstanding: many swords "lost" their Hadori polish, and may appear as if done in Sashikomi. A polish lasts only so long, and after decades of using Uchiko - which is powdered polishing stone - Hadori tends to fade.