Wow, well thanks for such a detailed and prompt reply, it's nice to see a vendor paying attention to their user forums for a change.
It's a shame that I went through all that trouble and wrote all that criticism for a version of the tools which wasn't current - though I do admit I was a bit disappointed when I first downloaded them to see that the "latest version" seemed to be over a year old. Also glad to hear many of the issues I identified have already been sorted.
Regarding xdg-open, the issue is less to do with distribution and more about which desktop environment you're using. I am using xfce so I dont have gnome-open of kde-open, the same will be true to anyone using xfce, or some other DE, regardless of their distro, so you should definitely switch to xdg-open for more broad compatibility.
As far as the encryption goes, are you saying that the pro version of the linux tools will sync encrypted files? If so, then that is definitely a big selling point for me as ideally using the sync would be my primary way to interact with the service. I do like the idea of working with a virtual drive / FUSE mount, but without some way to auto-encrypt new files copied into the space this is a non-starter for me. Your suggestion about some kind of global option is probably worth implementing IMO - if you could set a common passphrase to encrypt every file in the mount point, so that new files copied or saved there are automatically encrypted with the same key, that would go a long way to fixing the problem I think.
Overall I think the file encryption user experience needs to be a bit more seamless. I appreciate the granularity you get with being able to set a different password for individual files, but in practice no one is going to do that because it's too many passwords to remember, I expect most users will have a single password they use for every file, or at best a small set of passwords for different clients' info or something. I think a better solution would be using randomly generated keys and storing them in a database which is encrypted to the user's password or something. Then once the user is logged in the client can download the db, decrypt it, and access all their files.
Anyway thanks for taking the time to respond to my comments. Is it possible to get a trial of the pro-tools on the individual plan (similar to there is for the business plans)? I'm definitely interested to see if the newer/full versions will meet my needs, but I am not about to pay for them without testing them first.