Why do we need a metronome? I tell you why!
I loved to loop some of my song ideas with my (15 years old) Boss Loop Station. You simply have the option to adjust a tempo and the metronome starts exact at the time you push the record button. Also it quantized the recorded loop, so it has EXACTLY n beats.
You don't have to worry about synchronising an extern click, either on stopping the record at the exact time.
The Kemper looping function is (in my eyes) totaly useless. Or at least non practical. It's hard to keep the tempo over several beats and it's even harder to start and stop the record on point. This is very annoying, if you where able to record without any mistakes and the loop is useless, because you missed the right instant of time.
As a software engineer, I can say that it can't be that hard, to implement such easy functionality into such a powerful tool like the KPA. Especially, when there are 20 years old looper with twice as much functions!
On the other hand, the reverse and the half-speed functions are needles. I've never used them nor have seen someone using it.
So in the end:
+1 for metronome in the looper!