Hi Ted,
While slightly intentionally misconstruing your question - features that are only found on some binoculars, that I find useful - are:
• an IPD scale;
• a focus distance scale, and;
• an integral tripod mounting point.
The first two were usual on older Porro prism binoculars, but are notably lacking on current roof prisms.
Though either could be easily and cheaply included on many designs.
Similarly most older Porro’s were easily mounted to a tripod by attaching a mounting clamp to the exposed axle.
With roof prisms,
the superior mounting system is Swarovski’s TA-SLC, but it does require an integral mounting point on a binocular.
It can be used on both the original SLC’s (excepting the x30’s), and the all new SLC models from 2010 and on.
What astonishes me is that Swarovski didn’t then make the same provision for it on their EL/ EL SV, EL Range and NL lines.
Leica doesn’t make anything similar. And while Zeiss does make something similar, it’s for the Conquest, Terra and now SFL models,
but not their premium offerings.
For more, see the relatively recent discussion and images at:
Nice things from old binoculars that most new ones don't have
John