Earlier quoted context omitted.
As far as I know, it's par for the course for immigration in most countries I ever heard of. On the other hand, anyone who heard of consistently nice immigration procedure for normal people (not Messi) should chime in. From a incentive strucutre POV, they lose nothing from false positives (denying entry to someone who would have been fine) as candidates will probably try again anyway, and no one will come after them…
Other countries that see immigration as an opportunity have systems that are far far superior to that of Germany. In Germany it's often not clear what status a process is in and no way to get updates. There often is no web portal or anything like that, it's nuts. For instance you submit an application for the retention of your German passport and then basically wait 2+ years for the answer to come back. No one answer…
On your experience, it really feels like a PITA. It won't help, but Japan and France are basically the same. You'll see procedures listed as typically taking 2~3 months, check back every now and then, and low and behold a year and half later you have absolutely no idea of what's going on, if your submission has been forgotten or is contentious. There's no recourse as long as you haven't been refused, so it's limbo until something happens.
People are right to bitch about these lengthy and utterly frustrating procedures, I just don't see a way out of it short of being rich, famous or finding a loophole that lets you force a government agency do something in a timely manner without getting a target on your back.
To note, France had much progress in the last decades, in that bullshit requirements were made illegal a few years ago. At least you can check everything needed on an official site and not be subjected to petty additional requirements when dealing with the local entity (yes, that was a thing, probably to make it extra hard for specific portions of the population to properly file procedures)