Yep. If you are an experienced investor, 50% is probably not enough. But if it is for newbies, 50% is very very enough, it is even too much as you stated above. At the newbie level, it is better to use a small number of funds. Learning should be the focus, not the potential profits. Only people who have enough experience and knowledge, can consider using 50% of their funds for Bitcoin or altcoins investment. We all believe in Bitcoin future, but sometimes newbies often panic when the price drops drastically. They can fail to take profits if they sell their BTC or altcoins in panic. A newbie needs sufficient experience and knowledge to be a strong holder.
For the initial stage, the higher the percentage of bitcoin that beginners have as an investment, the better for them. Beginners will be safe to invest in bitcoins even if they don't actually have enough knowledge to do the analysis, they just need to buy and hold and secure bitcoins in a non-custodial wallet. In the long term bitcoin will increase because its future potential is very good, so it will work in their favour.