And wifi (well, on most - until GN get around to (re-)fitting wifi to the ex-c2c 387s). And a much nicer internal ambience. And actual carriages with doors between them, so you don't hear noise carrying down the train from three carriages away.
I'd imagine that those of us living north of Cambridge are not going to be happy about seeing 700s show up again. Certainly I'm not.
It does seem the wrong way round. 387s are great for the express trains, and less so for the stopping services that hoover up large numbers of people at multiple stops (so some people will then have little to no chance of getting a seat OR moving freely through the train to spread out and make best use of the room).
Now if they do 700s in the peaks and 387s off peak then that's okay, but even people who prefer the ambience of a 387 and a table won't really care for having the aisles crush loaded and it being hard to get off, or go to the toilet.
The 700s were built for a purpose and if people think the passenger numbers have fallen so they're not needed, they clearly don't travel very often.