I'm sorry that you think so but if you got utility out of it at the time commensurate with the work you put into it, even if it isn't the future, then it wasn't a wasted effort. We don't need to be so attached to our particular systems that we are excessively loss-averse to changing how they work or changing to different systems altogether if the first one doesn't work out for whatever reason.
If GTK+ doesn't work out and gain significant traction outside of the GNOME desktop internal utilities, it still had a good run and it was useful to people for a time.
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