Any component can get damaged in transit so what is your point? Your S900 and Tyros 3 aren't any less susceptible. In addition component failure rates average about 1-2% so even brand new products can and do have failures. Not long ago end users reported some brand new Yamaha arranger products that had problems from the onset. Be it poor workmanship or standard component failure it happened, even to your beloved Yamaha.

Touch screens have been around for a long, long time and have been used in many applications (mall kiosks for example) where there use is 1000 fold compared to what anyone would ever use on an arranger. They are tried, true, and quite reliable. On earlier keyboards that utilized touch screens problems existed primarily because the products CPU didn't have enough horsepower to handle all functions quickly and that would slow down the touch screens response time. This is a problem with the manufacturers trying to cut costs and is by no means a reflection of touch screens being sub standard to a standard TFT or LCD screen.

As someone pointed out even Yamaha uses touch screens on their very high end MI and Organ products. It seems they choose not to on the Tyros and PSR products most likely due to bean counters wanting to yield higher profits.