Only the 17" ever had a expresscard/34 port with very few uses that Thunderbolt doesn't take care of. It also added to the dimensions of the older model.
None can handle more than 16Gb and that comes as standard.
It has HDMI, USB 3.0 and 2 Thunderbolt ports. That's simply swapping Firewire 800 and Gigabit Ethernet for a display connector and a more flexible connection.
I don't need any more storage for my day to day uses than a single 256Gb SSD with plenty of spare space left and secondary storage for multitrack audio that would be taken care of by an inexpensive high performance SDcard like the low profile JetDrive. No need to carry a bulky external drive for additional storage, although 2.5" bus powered USB 3.0 enclosures are available and no need to butcher the system with dual internal HDDs and put a DVD I'll never use in an external case. The only reason I need secondary storage isn't for capacity, it's for physically having a different destination for files than the boot drive.
Not true. The 15" had a slot pre-unibody.
Less capabilities out of the box. In effect, one has to buy other adapters to make it work just like the previous generations did, adding removable parts
and chances one of them breaks. You forgot to add the need for a VGA adapter as almost all projectors still use that standard. Plus unwieldly.
Yes TB was supposed to replace them all, but it didn't. Even now TB peripherals are not very common, or staggeringly expensive, or just don't daisy-chain well. To me more power means more data to process (either media creation or virtual machine development), and 256GB internal just won't cut it, as one would tend to put all its digital life on a powerhouse machine. I consider 500GB to be a bare minimum.
DVD isn't included, which is ok as far as weight goes, but isn't included in the box, just like the other adapters, also meaning you won't be able to do video-related stuff if it resides on a DVD. In effect, you pay more to get equivalent functionality.
Of course to make use of all this power you need a decent and working OS, which Yosemite sadly isn't.