End of support for OS X 10.4 and 10.5

Someone just mentioned that Mac users love their "ancient antique machines." Actually our machines are neither ancient nor antique! They are just well-built and robust, qualities lost for the most part in our modern age. I've had to replace hard drives on the cheap PCs for others I work with almost every year and I now have a stack of much younger PC laptops paid for by you Mr. and Mrs. Taxpayer waiting to be junqued. Is that kind of planned obsolescence something we see as desirable, logical? On the other hand, I can't seem to kill my Macs. Hell, my own original LCII from 96 still runs! But my very expensive, very stable G5 tower, while yes, a decade old, is a workhorse and can link up to any of a number of also decade old scientific equipment (that you wouldn't want us to have to replace every 2-3 years!!) Dropbox ceasing to serve legacy Mac users may actually seriously impair U.S. (and perhaps beyond) scientific progress as I imagine there are many such machines running <OS10.6 in service to research endeavors. We're not playing games and storing and exchanging cookie recipes & vacay pics here! This will be a serious impairment.