For instance, Metro lacks a file chooser where you can easily find files anywhere in your system. If the Metro interface had a good file chooser, you wouldn't have to drop out to use the file desktop chooser to find a file on any filesystem.
If Windows 8.1 adds a good file chooser and if Microsoft addresses a few specific problems like that, life in Metro could get much better.
I hope Microsoft can get its branding straight -- I find it weird that I click on a music file across the network and it pops up in a pretty Metro app with the tag line "Xbox Music". There's also some thing (which has never quite worked for me) called "Xbox Games" which I'm not sure will do anything for me if I don't own an Xbox.
Or is everything that runs Windows 8 an "Xbox" of some kind? And how come I see tiles for all kinds of music except for the music that I've got in my own collection?
I'm having trouble coming up with a use case where I'd need the file chooser to do any of the things you'd want to do in the touch interface.
I can't speak to the music file thing because I haven't dealt with music files in years, it's always been an annoying and tedious experience for me (as is working with any large number of files with wonky metadata), so I switched to streaming and haven't looked back.
EDIT: That said, videos on my NAS just show up in the metro "Videos" app and I can watch them without issue. I haven't tried it with music but I can't imagine why that would be any different.
A good file chooser enables that scenario and generally, maximizes the benefit that Windows 8 brings to a tablet OS, which is the Windows desktop. If Metro can stream, read from memory cards, view files from Desktop apps, etc. the high purchase price of these systems would be justified.
I never switch modes unless I am switching tasks.
Desktop tasks (writing code, workign with office apps) all mouse/keyboard/trackpad
Consumption tasks (news, video) all use touch with keyboard folded out of the way
Drawing and taking notes I use the stylus.
I see this as having the right input mode available for each of my tasks, not some sort of "nightmare".
Making it easier for people to skip Metro will only result in fewer developers writing Metro apps, not more, so it's hard to see 8.1 as a positive for Surface users. They need the Windows world to be more Metro, not less.
One example was at launch, Chrome's build didn't work well with touch. If you touched a dialog, the on-screen keyboard would not come up automatically. Scrolling with your finger was near impossible unless you flicked up first... which made no sense. The desktop side of Chrome has gotten better, but I'm not sure who to praise for that.