I'm with Joe on this one, however with a a twist. It depends on my IOS device (I'm running the current version as of today 02/10/21).
On my iPhone, the default reminder sorting order is by reminder due date. Perfect! Which is good because... as mentioned... there are no longer sorting options.
On my iPad... same version... I have no idea what it using for sorting. It is not reminder, created, or edited date. I see no reason for the order of my list. Since I run with about 150 reminders every day, completing between 50 and 60 each day, this makes my iPad useless which was very painful since, until this morning, the Mac version was also not being terribly helpful with reminders (the legacy version is rock solid).
Anyway, I want order options, and at least, consistent ordering on devices with reminders sorting by due date.