Future fins are for waveboards - I assume you were talking about TT fins Toby, or have you switched to surfboards now ?
Anyway, the bigger the fins, the bigger the problem with sharp fins
And the smaller the fins, the less problem you have if you sand them down to be really blunt, so just do that..
On a TT they are so small that sanding them down would hardly be noticeable for anything but pure speed riding (but on the other hand, as said - you would hardly ever come in contact with your fins unless you do board offs)
But TT fins are also sharp on the "bottom" and not just the trailing edge - and I have even seen some with a sharp leading edge.
Can be very risky regarding getting cut, when no on the board, true
So as said - just sand them down if they appear "threatening"
On a surfboard it is more critical, if strapless - as you can easily land on the board jumping or doing aerials
Strapped there is only a smaller risk, when the board tumbles in the wave with you - but the risk is there
On a raceboard it can also be very annoying - as eventhough you never "land" on your fins - you will very often come in contact with the fins because of their very size and number
So you can easily get small cuts or wetsuit cuts even when just waterstarting and placing your board if not very cautious
So blunt fins would REALLY be a good and practical thing here
BUT, those racing seriously would usually aim for any speed (less drag) gain possible, so many would have really sharp fins
Just my view....