Personally I think fat bikes are a fad and in 10yrs they may well be history.
I just don't get the tow path or slightly muddy trail commuter bit, not an option a lot would consider or use to get to work unless you are into your mud plugging. The close fitting and poor mudguard clearance would soon crud up .
HDB's yes if money is in the kitty would save an upgrade possibly later on.
Not sure I agree. I think it depends also on where you live.
For any journey I make, I have a 2 mile roll along our local lane which is deeply rutted and used by a number of farms also on the lane so is normally covered in mud/cow dung. Add to this single-track lane the slippery line of grass and moss running along the centre and you get the picture. I am not commuting but to go anywhere, my bike has to handle 2 miles of this first before reaching a more typical surfaced road. If I turn out of my driveway in the opposite direction, then it's a good 5 miles to the nearest 'clean' road.
I have a non-electric bike with 1" road tyres which does nothing more than slither and skid along the lane so is unusable, especially now that autumn is here and the lane is usually permanently wet.
If any traffic, usually tractors, is also on the lane as my bike then this necessitates pulling onto the bank. Road tyres would sink in so good, broad grippy tyres are needed, along with mudguards to keep clothing clean. Mudguards wouldn't clog - the mud is too sloppy and the cowpats remain semi-liquid!
There is a definite need for a bike with chunky, grippy tyres on some roads, particularly in rural and agricultural areas such as here. A mountain bike would be overkill whereas a typical road/commuter bike would struggle. This Rio could be a good middle-ground offering the capability of riding on lanes (vs. clean roads) and tracks. It's not everywhere which has smoothly-surfaced tarmac or concrete roads!