Et sans résultat! (ESR) allows pre-measuring. When running games at conventions we get asked about it from time-to-time. My answer is typically that I’m a fairly young guy with quite good eyesight, and it seems poor that someone else would be penalized in game play because they were older and their vision wasn’t as good.
ESR also uses largely familiar measurements that people can guesstimate fairly well. Depending on the ground scale you play at, most people can visualize 6 inches, a foot, two feet, roughly correctly. 3 3/4″ is not a measurement anyone can be expected to correctly guess by looking.
Another factor of this debate that is often ignored, is that natural rulers exist. We commonly play on tables we know the length and width of, we often know the approximate footprint of buildings we’ve set on the tabletop, the frontage of units is almost universally known, for those who play with roads and rivers that are set on top of the tabletop in strips, those lengths are commonly knowable. Which is to say, there are already rulers present and allowed in all games simply by default.
To allow or disallow pre-measurement is obviously the discretion of the game designer, game host, and group of players playing. To my mind, it simply seems impractical to disallow it.