Redstone clock should be made faster as a lot of player nowadays want to build their own pumpkin farm but they can't find the suitable clock since most tutorial they followed on youtube is using a fast clock and this really cause a problem for them
This was made in order to stop lag, big automatic redstone farms will cause huge lag to the server and will make it unplayable.
It isn't true that redstone clocks don't work. It's just that they only send 1 pulse, every minute. So if you want to make a fully automatic farm, you can, but it will be very slow. This was done in order to prevent lag. Because what do you want? A huge, working, pumpkin farm but constantly 20 fps maximum, or a really slow farm but smooth gaming? I wold prefer the second option, honestly. Lag is annoying and this was the best solution to stop it. If they would repair the redstone, it would be a chaos.
use passive automation like bud switches and observers. (unless they have changed things since the last time I built something) red-stone clocks have their uses, but they are very resource consuming.