Painting should have been done before the installation was put in place. How does one reasonably paint around this jumble now? It’s super annoying or leads to the patchwork quilt on the wall.
You can paint quite well behind pipes if you wrap them nicely with foil, e.g. garbage bags, so that you can easily work on the wall in these areas with a small roller. Once a pipe gets paint on it, it looks shabby.