the Renown and Repulse could have been superships

If the latest technology had been used, the Renown and Repulse could have been superships. that would have required small tube boilers and geared turbines. That combination could have given them higher speed and a little more weight to have been put into armor. The weight savings from small tube boilers would have been considerable. They could have been given a greater SHP and with geared turbines, the propellor efficiency could have been increased. The net result could have been a greater EHP and, presumably, a higher speed. The basic hull was perfect for speed. The length to beam ratio was about 8.8, which was quite extreme for a capital ship. So, the "what if" design would be the same dimensions, with a slighter greater draft, 8-15in/42 guns, 16-4in/50, perhaps a 7in belt, inclined outward, about 28,000 tons legend displacement, 125,000 SHP, with small tube boilers and geared turbines. We should easily have seen 32 knots and could hope for 33. It would be interesting to do the calculations to see what was possible. Even in their original form, they were capable of 32 knots, if only on trial, and pressing their boilers.