It can also indicate a process that is (currently) beyond the capabilities of the interface available (thinking the difficulty of programming a VCR when you have four buttons and one LED that can display 88:88 and that's it vs a full touchscreen interface on a phone).

Arguably the VCRs did as well as they could - BUT they made the critical mistake of not realizing that programming and setting the clock would be difficult (and for many uses of the machine, not necessary at all, so nobody would bother figuring it out), and so didn't set the VCR to just not display the clock until the time was set. Very few people bought VCRs to use as a clock, after all.