I guess, this makes especially sense in the use of presets in live use, as it needs programming beforehand:
Long bars can be internally divided differently (simple example: 7/4 = 3+2+2 or 2+2+3 ...), or a series of different bars 4/4 + 4/4 +4/4 + 5/4 could be programmed to the midronome as one 17/4 bar. Then it would be nice to mark the subdivisions with, for example, a brighter or darker flashing LED or/and a different metronome tone.
Imagine losing track after 10 beats and having to wait until the 99th to find the 1 again...

Even in 4/4 bars I find it groovier to play along with the metronome if the beats sounds differently (i.e. back beat accents or on count 3 ... like
! _ * _
1 2 3 4
Since various metronome sounds are already stored, I hope that this can be implemented without too much hassle.
Programming could be done using the 3 buttons tap (tap through sounds?) / play (go to next beat) / mute (have no sound output) and/or the rotary encoder, I guess.