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I would like to know how they did the cool solder mask color designs.
Just FYI, this is mostly for appearances. If your assembly Is going in something critical like medical patient qualified devices, nuclear power plants or SpaceX Rockets, your friendly IPC quality inspector is going to have a conniption fit. ;)It is in fact beautiful though.
True. There should be lead protrusion as well as a concave fillet. Although if there was evidence of the lead in the hole on on the destination side but no lead protrusion on the source side that would make this Acceptable for Class 1 and a Process Indicator for Class 2 and 3. So it isn't a IPC defect, but you're going to spend a lot of time arguing that with your quality inspectors.
Circuit Board Design Class
A little flux goes a long way. Even an inline parallel splice (much cleaner, less bulky and ugly) with proper solder flow, can be effectively as strong as this one. Note: if you're putting enough tension on the wire to separate your solder joint before the wire gives way, you likely didn't have very good solder flow. However, perhaps the point to make here is your wire/solder should never bear a load great enough to separate either.