RE: So then. Fluence or... dare I say LEAF?
As a purchase, no, I wouldn't buy either.
A good finance deal with a good GFV would be the bright thing to do. At the moment, as an alternative to the Fluence you have a choice of either the Leaf, or ... er... ? So it would seem logical to me to enter into something which is not a huge cost to you in a few years time when there's better stuff launched.
If I really wanted to buy something and I was prepared to buy either a Fluence or a Leaf (your points also being ones that, for me, count against the Leaf), I'd go for a nearly new Acenta. The reasons are largely because of it being a 'known quantity' and also that there is scope to use the fast charging network .. well, at least for the moment until the whole idea becomes a victim of its own success and they are always occupied by someone else (which seems to be a time rapidly arriving already, even though there are only a couple of thousand Leaf around).
I like the Leaf well enough, but I'd buy neither just at the moment. Modern small diesels are so economical that it makes no sense not to buy one if you are after an 'extra-urban' commuter vehicle [with a bit of fast road to clean out the DPF every day], and if you are after something else then EVs don't make much sense. For me the 'jury' is still out, and come this time next year I am handing the Fluence back. If I can't find a way to buy it back for significantly less than £5k (I'm actually thinking it should only be worth 3.5 to 4k by then) then there will be another 2nd hand Fluence up for sale then. Whatever I pay for it next year, if at all, has to be viewed as a total loss after a finite number of years. There will still be 2 years of drivetrain warranty left.
If I keep it for 3 years I can convince myself that I'll have got my money's worth, and perhaps Renault might still honour any big failures in year 6 (UK law governs fitness for sale for 6 years). But after that, I have to be prepared to throw the car away and so if I pay more than £5k then it's not worth it in the way I look at things, it would be an unnecessary risk.
I saw one of the Fluence adverts offering a PCP deal the other day. If you could push them on that, maybe they would be only too pleased to move those cars on, as some have been with the dealers for over 6 months now. They don't like having cars for that long.