I personally believe that it is not important for any new investor to invest into anything other than bitcoin when they are just getting started investing, so they might well start out with only having investments of bitcoin and cash, and then they can perhaps work out their bitcoin accumulation path from there and at some point down the road figure out if they might choose to diversify into other assets beyone bitcoin and cash.
Yeah, I think you're very much correct when you said that is very important for new investors to start from bitcoin investment.
Starting with bitcoin when starting out your investment journey gives you an edge to solidify yourself as an investor instead of a trader, this is because there aren't other investments to distract you as a quick profit from a different investment (this could entirely be due to luck, there are also other factors that can cause this) might influence you to sell your bitcoin in order to make another quick profit which will ultimately backfire once you start losing your investment, so newbies should stick to bitcoin, build their experience and after which they can consider other assets if they want to.
Because this will also enable them have a Long term investment idea, because the reason why most of this new investors are finding it very hard to invest in the Long term is because they only have short term experience.
Every new investor in bitcoin has little to no experience on bitcoin investment because they are new, most try to acquire knowledge, but knowledge isn't experience, being ill experienced as a newbie is not a fault, choosing to stay ill experienced after already becoming an investor, not broadening your horizon becomes a problem and that's why they have issues along their investment journey which discourages them and pushes them to turn their sights to trading
It might be that they started this crypto journey by investing in those shitcoins which can profit them within a short period of time, which is why they always find it very difficult when investing in the long run. But when you recommend new investor to bitcoin investment more especially when they are still getting started, with time they will get used to it and then they can even prioritize bitcoin investment over other crypto investment.