Since this seems like an attack on something I spend my personal time on, I will just say that I have fixed every bug that I can verify and has been reported with sufficient information to resolve. In your case, of the four issues you reported, one was fixed, one was not a bug and the other two required more information to resolve.
That being said, it doesn’t work for everyone and may not be a good fit for your specific situation. The goal of it is to provide automation for people who are familiar with how grub works on Manjaro. Not to be a replacement for things a power user can do by hand.
That is what I was referring to as “acrobatics” and what you describe is the opposite of “just works”
systemd-boot has been around for a long time now. It doesn’t seem to me like lots of distros are moving to it in the near future. It seems more like the distros who want to use it, already are.
Again, I am a fan of systemd-boot so don’t take this the wrong way. I just don’t see it as the clear path towards the future. I see it as one option of many. It fits some use cases well but grub fits a bigger variety of use cases in a more automated fashion. Unfortunately, to do that, it brings with it a bunch of complexity that many of us find unnecessary.