No offense, but I can't imagine this being a high-priority change. The X5 is, first and foremost, a high-quality DAP. last.fm has absolutely nothing to do with and, moreover, is something that only those with an interest in last.fm will use (personally, I prefer Pandora). Fixing the 5800 file limit, improvements to tagging and search, tweaks to the GUI -- these are of far more interest to most people than a kludge to an outboard WiFi adapter and an interface to a specific on-line service solely for the purpose of updating it about your musical tastes. If that's really important to you, then I respectfully suggest that you're not really interested in a high-quality DAP and would do better using your cellphone.
This is something I notice a lot in this forum -- people assuming that the way they want their music delivered is the ONLY way that music should be delivered. That's truly short-sighted. For example, I only listen to full albums and I'm perfectly happy with the folder listing capability of the X5. However, I acknowledge that many people like to listen by artist or genre, or enjoy random shuffle of songs, so I agree that the 5800 file limit for tags is important (I even suggested a way that it could be done which, from what I understand, is the approach that the Fiio engineers are working on).
I don't know much about last.fm man, but I think people want to have both (i.e. listening to last.fm stuff with a high-quality DAP, which then allows then to switch back to their high quality loseless files as and when they want). I agree with your point about how some features are more sought after, but I am afraid I cannot accept your point that last.fm users should use cellphones
PS: And the user you have quoted is not requesting for such support; he/she is referring to ReplayGain support.
Edited by darkarn - 8/17/14 at 6:00pm