Not sure how you sync but I sync and my boss syncs with more then one Mac and it works fine as it should.
You set the options properly.
You cant sync the phone between different computers if youre trying to sync up music and the like, or itll wipe all the media. Known issue, and apple admit its intended.
As for features the other phone had - That is an apple dig which is pointless to be honest. All next versions of phones have things you would say should have been in the other. HTCs next phone in testing by the FCC has a keyboard people saying they should have done ages ago.
HTC have never stopped making and selling phones with keyboards, but they havent been huge sellers. Either because they were badly executed (X1, Nexus 1), or being sold as branded handsets through Network operators (XDA/MDA/SPV). As a brand HTC had issues with market penetration, and now they have that they can go back to adding keyboards to phones. Plus the old HTC phones are ugly, I know this, ive had a couple. Great feature set, great ergonomics, poor look.
When the next Nexus phone comes out it will have a better touch screen as the one it uses is quite old compared to everyone else on the touch screen tech front, even google admits that and tells people they should by a droid for example.
Just Apply trashing that.
HTC again didnt build that for themselves, they did it to a design brief. Network operators want to limit your use of the phone features due to costs. If youve got a full multimedia handset with 3G and WiFi they dont really want to you using up all of your minutes, texts and data plan. The less you use, the more they make out of you. Thats why network branded handsets often have features missing compared to the same handset with the manufacturers own brand.
My Wife is a prime example of a non-tech user. Shes been on a 3G for 18 months, and her main reason for wanting one in the 1st place is "Its pretty". it took her a couple of months to work out the apps even as she refused any help setting it up! Ive just ordered her upgrade from that, and shes opted for a HTC HD2. Because its not going to piss her off, the camera isnt sh*t, and she doesnt have to use iTunes on windows. I had NO input to her choice beyond driving her up to Carphone Warehouse and pointing her at the smartphones.