I use EFTSTUB with Arch Linux and I agree about it taking up more of your time. However, for me, this was all the very start to first set it up. Since then, it’s been smooth sailing.

I also use multiple kernels and I have had issues with kernel updates, and no issues with kernel parameters. However, there is friction with creating separate entries and so I created a very simple shell script to save my commands.

I’ve had no issues dual booting with Windows using BitLocker. I do not use secure boot (yet).

If you’re willing to spend an hour to set it up, I’d go for it. However, that’s an hour of your life you can save with Grub.