I have one thing going on in my mind for quite long i.e. DCA is also a form of lump sum investment. Like if a person is investing 10$ per week then he is like investing a lump sum of 10$ in week one and then a lump sum 10$ in week two and so on. DCA is also a kind of accumulation of Lump Sum investment that are made over a period of time. It's my own interpretation, it may or may not be correct.
You also have a valid point that anyone who invested a huge money several years ago and is ignorant about Bitcoin that he didn't invest at later stage, such are just hypothetical assumptions. The person who is inve. sting a lump sum money into bitcoin is well aware about Bitcoin and will continue to invest in Bitcoin over a period of time.
Okay, so you're saying DCA is like making a bunch of small, separate lump sums. Kinda true, but it's different. Lump sum is ONE big investment. DCA is many small ones, spread out. It's like the difference between dumping a bucket of water all at once versus slowly pouring a glass at a time. Both get you water, but DCA is less risky. Anyone who put a load of cash in Bitcoin years back probably knows the deal and is likely still adding to it, just like you should be. It's all about stacking sats, whether big or small.