You use words like "odd" and "bizarre" to describe many people's reactions to the QE's passing...
I humbly suggest that it's it is simply that you don't understand a certain perspective here. That's totally fine -- completely fine -- because there's no reason to expect we all could or should share the same perspective on this.
I humbly also suggest that, while there are certainly many criticism that could (and should, probably) be leveled in good reason against monarchies in general, and perhaps this monarchy in particular, today is maybe not the right day to do it.
Today a lady who was very meaningful to many people has passed. Why not let them grieve?
Imagine someone important to you died today. They surely weren't perfect, but is today the day to harp on their negatives? The monarchy has been around for centuries. If your criticisms have any merit, they will still have impact a few days from now.
Anyway, whether you're lucky enough that no one important to you has died (yet) or because you don't have that sensitivity, let me assure you: today isn't the day to pursue your criticisms of those that have passed today. Hang on to it for now andtell everyone about it later. If it's really something worthwhile, it will have legs later, too.