It is up to each person's investment allocation. For me to split the investment, one is to hold the project that I find it has a good future. Secondly, the altcoin is likely to increase in a short time about a month back based on the technical analysis that I found.
I agree with your opinion, for us we must have 1 quality coin and have a good future for the long term. and we must invest more than 1 coin to get a reserve opportunity if other coins are low in price. just as we farm to plant many and varied seeds to anticipate if one day fails on the other side there is an opinion, basically it must be balanced in investing.