That's all very neat but first, you are ignoring human nature - DCA is a great way to avoid fear and greed.

Also you are looking short term when BTC is clearly a long term asset.

It's very easy to find the bottom when looking back - we are all excellent monday morning quarterbacks - but can you tell me right now if this is the bottom?

No, you can't, nobody can and that's why most people would be better off by DCA and perhaps also buying any dip that comes along even if it's not the bottom.