Right but you are talking about a fraction of an inch of extension, so 2" or 5" of quill range won't matter much except for drilling. Even with drilling it just adds a step, retract the quill and lower the head or raise the table as appropriate. My Clausing has 3" of quill extension, but I don't think I've ever maxed it out. For one thing drilling a hole more than 3" deep would be pushing the limits of space for the mill anyway, with only 16" spindle to table.
I have used the quill for fine adjustment, but talking about thousandths of travel. Personally I find using the knee to set height to be pretty accurate. My Sherline doesn't even have a quill, and it manages to be pretty accurate.
Quill is nice, but quill extension isn't the place I'd be be drawing a line between one mill over another unless it was one has a quill and the other doesn't.