i know this is a tech forum, but seriously, who cares?
this isn't 2000 when specs. mattered.
It matters a lot.
Thunderbolt 3 is nice as rugby mentioned, and it's not just about 4K displays. We're talking all sorts of things including stuff like 10GigE networking just to name one.
HEVC H.265 is also a big deal IMO. Right now even the iPhone 6 and iPad Air 2 support it in hardware but none of the Macs do. Once Skylake drops, FaceTime will be able to use H.265 on Macs too. Furthermore, eventually there will be hardware H.265 decode support in video apps, which will mean that H.265 playback will use a LOT less battery power. I currently have two Core 2 Duo Macs sitting side by side. I'm typing on a 2.4 GHz Core 2 Duo without hardware H.264 support. Next to me is a 2.26 GHz Core 2 Duo with hardware H.264 support. Guess which one is more pleasant to watch movies with, and which one has (much) longer battery life with H.264 video? H.264 is still dominant, but H.265 is making a lot of headway already because the file sizes and bandwidth necessary are a lot lower. Going forward it's a good idea to have H.265 hardware decode in your mobile devices, esp. if you're like me and keep your laptops a long time. In fact, this is one of the main reasons I avoided buying the Broadwell MacBook Retina.
BTW, back in the day, people had a similar argument as you regarding hardware H.264 support. They kept saying it just doesn't matter, esp. since the CPU can decode it anyway. Well, within 2 years most people had changed their tune.