Unless there's something to spot a dock restricted system before entering it, or an alternate way for big ships to achieve standard procedures like refuel and repair, I think it'd be a counterintuitive feature.
That's easy to do, just have stations classed by what ships they can support, and stick that information on system maps so we can examine them before deciding to go there.
It would add some extra complexity to doing trading runs... do I take my huge freighter to system A, where I can dock but which offers smaller margins, or a smaller ship to system B which offers larger margins but of course, I'd be trading in smaller volume...
There is also possibility that with larger ships they are simply going to introduce parking gantries - they mentioned that not all stations should be composed of a single connected structure. So, non-rotational structures hanging in space around stations where large ships can connect to overall infrastructure, get refueled, trade, etc. You could maybe even then take a small shuttle over to the station proper - I assume big ships are probably going to come after walking in stations or even planetary landings.