modern boats are uncomfortable because they are fast. 6 knots to windward into a 2m chop and our boat is banging so hard you can barely stand up below. In the sort of boats I started sailing in in the 70's 6 knots to windward was a dream. You would be lucky to manage 3 into any sort of sea. Slow a modern boat down to 3 knots and the motion is the same as the old boats - you just have a lot more room to moan about it in.
I have taken our Bav into the southern ocean during a round tasmania trip. Worst we saw was 55knots of wind and 4m seas but it stood up pretty well and much drier than I remember old boats being.