If you are under 50. Buying btc monthly for 10 years and hodl it for 5 more.
Then at 65 it should help a lot for your retirement.
You cn have a 5x monthly dip buy. Ie if you save 400 a month dca. and BTC does a 20% dip buy 2000 in btc.
you likely will save 120 x 400 usd with the dca and catch a few dip buys.
so maybe
120 x 400 = 48,000 usd in dca
10 x 2000 = 20,000 usd in dip buys
grand total of 68,000 usd invested in a 10 year period then hodl 5 years this is a 15 year plan for people under 50
this is not advice.
If someone can use the suggestions given by you correctly then hopefully only 10 years is enough time for his life to change. But most people don't want to be a consistent investment here, they sell them when the bitcoin price goes up, they are far from long term planning. I agree with you that every success requires a long term plan that should be consistently worked out be it investment or income from elsewhere. But I've seen very few people do them and apply them in their lives.