I think retail traders with small capital tend to use high leverage.
For example a pro trader inside a bank or a firm managing millions of dollars would be happy with around 20% annual return and their risk management is totally different so they dont use high leverage or probably they dont use leverage at all.
On the other hand most of us retail traders, we play around with our 1k accounts and for us earning 20%=$200 a year, is not a very good return.
I think as the trading capital grows, it decreases the leverage over time.
Like... i dont really care if i lose $100 on a trade on my 1k account, which is 10%, bcoz i can make it back the next day. But imagine the pain losing 10% on a trade on your 1 million dollar account, which would be losing a hundred thousand dollars on that day. Now that would hurt :)
So i guess reducing leverage comes naturally as your account grows.