Yes it is risky, but what is someone going to do now just invest in Bitcoin and get a 2x for the rest of this bull run?
Hardly life changing is it. Its ok if you have big money but not if you are a normal person with normal working life and salary.
If you are a normal person with a working life and salary, you should definitely go for the dca method. Like you said, bitcoin can be life changing if you already have a lot of money to invest in bitcoin since bitcoin is just too expensive.
But this should not discourage people from investing in bitcoin. I would rather slowly but constantly invest in bitcoin than dump a huge amount of money into an altcoin I have no guarantee of making profits.