"unique screw head types and gluing or soldering components"
Aren't these all really just things that make it a pain to repair without actually stopping it? Digital signatures and the like within "approved parts" stops you repairing if there is another source, but you won't find them for custom silicon as making them would be an IP violation.
Unique screw head types - a bit of a pain until drivers become available.
Glue - more a cost / space saving approach that makes it a pain to repair.
Soldering - I'm guessing this is about soldered cables vs connectors. Connectors take a lot of space and introduce a potential source of unreliabilty (which can be much reduced by using higher-cost items). I do think that consumables (e.g. batteries) should not be soldered.