agreed battlecruisers work very well if used properly. they were never intented to go toe to toe with full on battleships that was 1 of the main reasons they were so fast
hoods belt armour was fine it was the deck armour that was weak (only an inch i think) she had started the turn that wouldve vastly reduced the danger from plunging fire litterally a matter of seconds away :(
the whole reason they were maligned as a class was because they looked so powerfull they were used as battleships hence their flaws were exposed
also battleships themselves were used poorly in ww2 they were intended to be used in fleets not 1s and 2s this left them very vulnerable ie pow and repulse etc etc