In theory it's fine that they're on your computer not the device, but in practice, that meansOkay, but how do you use 1980 IRs in such a way that you need them on your FX3 at all times? I can understand owning that many, no problem. But in my own case I only use a handful, at best. The rest live on my Mac.
a) Being connected to and working with a computer a lot of the time. You may do that already, but not everyone does.
b) Spending time shuffling IRs onto and off of the device, for zero added benefit