Tying up your money in Bitcoin during a prolonged dip can mean missing out on other investments that perform better during the time of the dip because one can use the capital used in buying in the dip to invest in other areas such as stocks, real estate etc so buying in the dip can make one to miss other investment prospects when the price is not up early
I don't really get what you're saying here because using an amount that should have been used to buy bitcoin at DIP price to invest in stocks or real estate does not make any sense at all. Do you think that real estate is something you will just dive into without enough funds. There is nothing bad is waiting for a DIP if you have some bitcoins already since the market experiences corrections which most people see as opportunity to buy at lower price but let it not be that as a beginner you just start with that approach of waiting for a DIP price to buy. As an investor there is need to have reserved funds which can serve for buying bitcoins when the price DIPs.