The problem is this...
You decide you want to shoot with a wide aperture and you then find that you've hit 1/4000.
- You remove your lens hood and put it in your pocket or bag or put it on a wall or hang it from a tree.
- You retrieve your ND case from your pocket or bag, open it and remove the ND.
- You fit the ND to your lens and either refit the hood or don't bother.
- You've put the ND case somewhere or you're still holding it so you need to put it in your pocket or bag.
- You take the shot.
You then decide to take another shot but as you've still got the ND fitted your ISO is 800 or 1600 and your shutter speed is 1/30 and you decide that you need to remove the ND filter.
- You retrieve the ND case from your bag or pocket.
- You remove the (lens hood?) ND filter.
- You put the ND filter in its case and put the case back in your bag or pocket.
- You shoot.
You frame your next shot and find that you need the ND again...
With my MFT G1 I was finding that on some days I needed the ND for one shot in three and juggling the camera, lens hood, bag, ND case and ND just got to be a right royal PITA - and that was with a camera with a base ISO of 100.
Another option of course is to limit yourself to f2.8 and I could often manage f2.8 and stay at or under 1/4000 but sometimes my limit was f4 and on the day I tried shooting with the ISO set to 200 I found that for a couple of shots the widest aperture I could manage was f7.something.
Compare that with my 5D or A7 which can shoot at F1.4 and 1/8000. I can't remember a time when I needed an ND on my 5D to stay at or under 1/8000 and so far I haven't needed one on my A7.
With an APS-C camera the situation isn't quite as bad as with MFT but these smaller sensor systems are possibly going to push you towards using wider lenses and wider apertures if you like the shallow DoF look and juggling ND's does detract for me at least as I not only find ND's a PITA to fit and remove when out and about but I also find that they and their use (fitting and removing and standing there juggling kit, which is a two handed job, does attract additional attention and detract from the unobtrusive style that I personally prefer.
I just hate being limited to 1/4000.
OK years ago we were limited to even lower max shutter speeds but it isn't 1954 any more and I came to love the freedom my 20D gave me and I just hate to give it up now.
The rising base ISO and limited max shutter speed is the biggest issue I have with CSC and if there'd been one available with 100 and 1/8000 I wouldn't have moved to Sony.
Anyway, rant over.
It looks a lovely camera and I'm sure that many will be very happy shooting at f8 all day