This is a sincere question. Why couldn't you just ramp up enough manufacturing so we could all just get the remote without having to wait 1/2 a year or more? Its kind of absurd and frustrating.
I've had around 30 years of experience designing and performing manufacturing engineering on equipment somewhat like the Kemper pedal, and there are several reasons that deliveries could be delayed, many have already been mentioned. It is possible that the present pedals are being assembled in a facility with limited production capabilities while that or other facilities are being readied for higher volume production. And it could be that the preproduction run did not anticipate the volume of sales that actually happened, so another batch is being built, and that takes time. It is not unusual for a company to have 6-8 week lead times from the manufacturer, and delays in delivery can increase from there.
It is also possible that some of the parts used in the pedal are on backorder, this is somewhat out of Kemper's control. That delivery time may get tacked onto the 6-8 weeks, if it is a critical part then the build cannot happen until the parts arrive.
The fit and finish of the Kemper gear I have seen is as good as anything I have ever seen anywhere, all the way down to the detail of the labeling on the chassis. My toaster is basically perfect, the only weak issue is the print on the serial number label. It is not easy to find a shop that can make and finish metal parts to such a precise standard, especially in small quantities. So that could be another bottleneck.
I am sure in time the footswitch will have its manufacturing delays ironed out and the supply will stabilize. But until then we can expect some intermittent delays. Perhaps the Kemper profiler had these same issues, but it took a while for it to catch on in the market, so the delays may not have been as noticeable.
I can guarantee you that the folks most concerned about the delivery delays are the Kemper people themselves. Someone is probably get a good chewing out right now if they have so many customers wanting product and it isn't available to sell.