UAE (original) mainly got sort of "abandoned" because original coder and "UAE inventor" Bernd Schmidt had been about to lose interest in his old project. Plus, he eventually found a job at a HUGE open source developing company, that's why his schedule gradually got tighter, too.
Toni at first did the AGA support (+X) only, but then later took over the WHOLE project, after Bernd called it quits.
We can be very thankful to him; otherwise Drummond's version on Cygwin would probably have been the only way out for Windows users. Or even, well, they would have been doomed to continue using the ancient builds