We’ve literally been using a 3.5kw charger for three years shared between the two of us. It really hasn’t been an issue at all.
My wife needs to charge twice a week, which happens overnight. I’ll charge mine when she isn’t. We don’t do mega miles, but not a single time have we both needed the charger at the same time – ever.
We’ve just had our OHME 7kw charger installed so now it’s even easier.