I think purse purse is necessary. Nowadays, hackers are stalking us, probably losing money at any time, so focus on this do not visit bad sites. So you are vulnerable to hacker attacks.
It is more like someone building a castle without a fence and some necessary security around to be able to wade off any attacker. The higher the security, the more it is difficult for an intruder to penetrate, which in this case are the hackers and for those who feel there is no need for security, I guess they will have to wait for the fateful day when they will realize that security is not as expensive and hard to do than losing your funds to some bunch of hackers.
Use of a wallet may differ per individual hence we cannot have a common opinion on wallet security under usage of a wallet. But security must be a basic criteria while choosing the wallet, based on this we may assume how important this aspect is.