Conceptually, LoL filled a hole. DotA was DotA, complicated, hard, lots of nuance. Some people wanted an even more complicated DotA. Heroes of Newerth filled that hole. Some people wanted a simpler DotA. LoL filled that hole.

I personally preferred HoN, but I can’t fault people for preferring LoL.

Essentially yes. I don’t know how much of the designs but weight driven and earlier water driven clocks existed.

Quartz? Quartz clocks are about 100 years old. You make it sound ljke we went from sundials to Casios lol. Mechanical clocks are around 1800 years old. Pendulum clocks around 500 years old and spring mechanical slightly younger.