The really nice thing about electrical tape is that has an extremely high ignition tempature, and strong voltage resistance, so can throw it on stuff that gets hot (in either sense) and not worry about it. I use it to block off the annoying LED "backlighting" on my PS5... that gets warm enough that I'd be nervous about some tapes. Also handy for actual electrical stuff, like that one speaker wire that loves to comeout of the terminal on my stereo if I look at it funny. I've had some strips of it for years and have never had problems with "smearing" or adhesion.
I've had some success with kapton tape, it drops the 'bright blue' down to a dull orange. Not perfect but its adhesive and knocks the brightness of the led down.
