^Buying Bitcoin with lump sum is the best strategy but the problem is not everyone can afford to dump at once which is why DCAing is very effective for accumulating Bitcoin even for the retailers. And also I wouldn't say selling at high is wrong because that's the basic of making profits by selling an asset while we can't really draw the line which is high and which is low due to the highly volatile nature so all we can do is just go with the instinct and try to make best out of it.
You can only describe something as best if that particular thing is convenient for everyone and has more advantage than the disadvantage, so saying lump sum is the best will be wrong because it is not convenient for everyone and everyone can not afford it and so the DCA still remain the best because everyone can use it to accumulate Bitcoin whether small or big and whether rich or poor. However, selling at high is not actually wrong that if you have hold for years and your investment is very matured but it is not right for low coiner to sell the little coin they have instead of thinking on how to accumulate more and any low coiner who sells when the price is high is obvious the person is a trader not an investor.
I am just stating the facts here, if you got lump sum that you can use it to buy 1 bitcoin then it doesn't make sense to divide that money into the DCA strategy. If you followed my post you can see DCA is the effective method to accumulate bitcoin when someone is can't afford to buy bitcoin in whole can use this method to accomplish their goal.
I don't understand what you're saying.
But indeed not all Investors have a lot of money at once but that doesn't mean investors can't invest in Bitcoin because they can buy bitcoin gradually.
You misunderstood my point, I am not saying retail investors should not invest rather I am just stating the facts of the benefits that DCA gives access to them to reach their goal whether it owning 1 bitcoin or whatever the amount is.
Let's see if someone with $1K of income wanted to own 1 bitcoin which I won't say impossible but it's bit out of the reach because assume they can save 30% of their salary for bitcoin investment which is effectively $300 which means it will take them 283 months to own 1 bitcoin if the price of bitcoin just stay in the 85K until they accumulate 1 whole bitcoin.