There exist all sorts of binoculars, astronomy binoculars, and even binocular telescopes, priced low to high. They can even become quite large, such as the ones offered by TEC:
https://www.telescopengineering.com/tel ... elescopes/
or by APM:
https://skygazeoptics.com/products/apm- ... gJbYfD_BwE
or Fujinon:
https://www.bhphotovideo.com/c/product/ ... gK-lfD_BwE
And there are even some binocular Dobsonians!
http://www.lotsofbow.com/bino.html
But I haven't seen or heard of even one Cassegrain-type binocular telescope,whether
:shrug: :shrug:
p.s. Is it all about central obstruction issues at low powers? But high power use would still be ok, right? Hmm. Maybe alignment becomes too difficult then... But still, none ever?