My thought is that, the reason for this rule is for privacy concerns, but then, I might be wrong, so my question is "are there or is there any security issue(s) related to using or reusing a particular or one single bitcoin wallet address for a very long period of time?
As it has been suggested by members, the use of a simplified payment verification often attached to the service providers which are the centralized exchanges isn't secured and one is not on a private mode as they are connected to a central server but the use of electrum or myecelium wallet rather than any other type could go along with privacy since running a full node could come with loads of financial amd technical challenges, therefore hardware wallet os recomendable.