Holding is better than trading. If you buy Bitcoin, and hold it from 2017 to 2020 or 2020, you get profit.
If you buy Bitcoin in 2017 and trade it in 3 to 4 years to 2020 or 2021, I am not sure you will have profit now. If you use margin trading, I believe your orders would be liquidated many times in 3 or 4 years.
Don't take risk and practice margin trading. You will end with empty hands.
You got a point, but it does not necessarily follow that Hodling is a better choice, especially when you're well grounded in trading. After price plummeted early 2018, how many traders were able to hold in their coins till date? I think the way forward is to be able to combine the two appreciably, there's no holy grail out there!