Split brain are easily solved, there’s of the shelf solutions and if you have some custom code you can use plenty of well researched solutions, for instance raft. Putting bizantine fault in Google scholar yields thousands of papers,if you want something fancier.
Same for most problems you mentioned, they were an issue 10 years ago, nowadays you can federate, abstract or outsource most of it.
Making it harder to identify SPFOs doesn’t increase fragility. If you whole system a single instance it’s trivial to identify (the whole thing) but very brittle.