I appreciate there has to be a limit placed somewhere, and that the limit is 5cm not 2 inches, it’s just unfortunate that my board is also 2 inches! I am working with the Micropendous modules, which are designed as a 2x20 DIL type module. I can shave off 0.8mm, if I have pads right against the board edge, or make some funny squished pads at the ends. Or redesign as 2x19, and lose couple of signals, somehow 2x19 offends the sense of rounding.
It would be a lot nicer if the limit was based on board area, with perhaps a max width/height, or the price rated to board area, but I guess Seeedstudio have their reasons.
I am planning a range of open source boards in the 2x20 format, I don’t really want to compromise the design for one supplier… even if they are very good. Generally I wouldn’t mind a 2mm pitch for connectors, but these are designed for hobby/proto work, and they all tend to be 0.1 inch pitch.
Would the system breakdown if the limit was 51 mm??