Some are worried if someday they got hacked or compromise their wallet, lost their keys, and etc...they spread their Bitcoin to different addresses but I don't think it was a good idea because, for me, it is much better to have it save in one wallet for easy monitoring. Unless if you have a lot of BTC's, 10BTC, 20BTC, or more, that is really advisable to split them.

But I don't have to worry about hacking incidents because I don't save a huge amount of BTC. I use to convert it to our local money, invest the money to the stock market, traditional business, and it all safe.