I think you just have to accept that desktop Linux has a different set of tradeoffs. It's not right for everyone but you were driven here because you couldn't stand Windows but you're already dismissing the alternative as 'proven to be bad'.
Has anyone bought the libinput maintainer your laptop hardware so he can work out why it doesn't work? You can see from the commit log that it's mainly developed by one person, who also developed the previous Linux (synaptics) touchpad driver for years before that.
Also I think you are underestimating how crappy and broken a lot of hardware is. See eg. https://gitlab.freedesktop.org/libinput/libinput/tree/master...
or read some of the comments here, lots are about ACPI https://elixir.bootlin.com/linux/latest/source/drivers/pci/q...
Has anyone bought the libinput maintainer your laptop hardware so he can work out why it doesn't work? You can see from the commit log that it's mainly developed by one person, who also developed the previous Linux (synaptics) touchpad driver for years before that.