I insisted that our brand new historical/maritime museum change from solid white oak to engineered white oak in a section of flooring. It's 11 ply material with the top layer being 1/4 inch thick............. no indentations in this one.Yeah, but that only means it could be either harder or softer. The process of making engineered has the natural effect of creating a harder overall product unless we're talking about a .5 mm veneer over something super soft. Those types of products, however, are really outliers. For the most part, if you're dealing with 2 mm and greater veneers and a decent core, there isn't going to be much variance at all in the indentation characteristics of an engineered versus a solid. I think the main reason the caveat about Janka not applying to engineered is because engineered can be damn near anything. It's a catchall term for anything that isn't one ply. Solid, on the other hand, is just solid. It speaks more to the inherent complexities involved in trying to wrangle all of "engineered" into a single definition than it does to anything broader.