Not sure that the OP is really comparing apples and apples. WLL and Airlink are (AFAIK) microcontroller-based devices that are designed from the outset to do one basic job, ie receive data from sensors, do some minimal processing and pass the data on in a summarised format, often over a different medium eg WiFi. These devices need to be functionally robust from the word go and are extensively tested and tweaked before launch. That's not to say that bugs won't come to light over time and need squashing occasionally but not very often.
Software like Meteobridge Pro runs (mostly) on low-power but full computers rather than microcontrollers. Something like MB is going to be much more complex and has many more diverse features than device firmware, so a lot more scope for needing updates. Software like MB is also a lot more responsive to user requests for new and updated features in a way that Airlink or WLL will never be. Different devices performing different roles really.
