Advicing a newbie to invest into bitcoin is also risky especially if he doesn't know yet how crypto market moves. We know that there are 2 phases of market cycle, the bear and bull market. If he buys at the wrong time, he could be holding it for a long time or worse sell it for a loss if something unpredicted happens along the way.
A newbie could also go all-in buying at one price which is not suggested as we all know bitcoin is very volatile. He should know what is DCA strategy before investing to manage the risk of losing his money.
I wouldn't disagree with your opinion but we have to also say that if newbies want to do investment for long term then it should not that much worried thing. Because if the person choose bitcoin as investment and for long term then definitely if he can hold at least for 4 year or more than 4 years he will definitely gonna make profit.
And the another best thing is suitable for the newbies is DCA strategy I think everyone should take this strategy in bitcoin for long term. This is the best risk management strategy. Where you will have lower risk and profit would be also good.