This is something that also puzzles me, I wonder if it has more to do with a sales strategy than technical feasibility. If such a nice optic was made 40 years ago (although I have the impression that it was not their entry level, but a device perceived as a quality instrument), one just has to imagine what would Nikon be able to offer (with their large scale production figures) on a similar contemporary device. It would seem that brands have "condemned" the small reverse Porro format to their low-end ranges you can find in most catalogues, from Opticron to Vortex. However, if I remember correctly, the 7x26 B&L/Bushnell Elite Custom was highly regarded, and was positioned and priced as a small premium bino. Given the apparent success of the 7x21 Curio from Swarovski, maybe a very bold (although risky) movement from Nikon could be to resurrect their yesteryear love affair with 7x20 and give us an ultra light, ultra compact 7x20 reverse porro with updated coatings on the medium-upper level. Somehow a premium version of the 8x25 Travelite EX, but in 7x20. A small reverse porro, like a 7x20 HG-P, or maybe better yet a 7x20 M7 (to make it more affordable): with a very lightweight quality plastic body and the lovely level of performance of a M7 8x30, but at around 200 g / 7 oz... and big eyecups, and regular focus wheel, like the Nikon CF III 7x20. Make it 2,5 - 3 times more expensive than the Travelite EX 8x25, at around 300 - 350 € (like the prices you see for the Bushnell 7x26 Elite)... and it could probably give the Curio a run for its money.
(One of the best things about daydreaming is that it's free
)