I have never understood why this is an issue between Christians, and I hope that someday it will cease to be such.
Only if all non-Catholics accept the Catholic teaching without exception. Can you forsee this happening?
It is one thing to theorize about the Eucharist, and another thing to celebrate it. In the Episcopal church in which I was raised, we celebrated it once a month (”low” Episcopal). In the one to which I returned in my forties, we celebrated it weekly (”high” Episcopal), and also had lay ministers who took it to the elderly and ill. In the Catholic church, of course, I can attend daily celebrations.
But, I am not at all familiar with the practices of other Protestant denominations. Can you enlighten me?