I still cannot understand your problem with Device Trees after reading your article, I used to write a ARMv8 and a x86 kernel and found out that ACPI and Device Trees had same capacities, but less headhaches with DT.
Nowadays there is also an overlay mechanism that is used for example on the Raspberry Pi expansion hats, so DT is not always limited to soldered-on things.
In practice the kernel only wants to add support for DTs that conform to a reviewed and approved schema, but most/no manufacturer wants to do the effort of having every single thing on their DT schema bikeshedded to death on the device tree mailing list before the device is manufactured. So the vendor just makes up whatever kind of unapproved DT schema that only their own vendor kernel fork supports, and if mainline support is ever added it will have its own DT.
It discusses this, alongside an interesting history of it, and the current state.
[0] https://en.wikipedia.org/wiki/PCI_configuration_space#Bus_en...