On the contrary, I'd say if you're not re-architecting your apps every couple of years then you're at risk of falling behind. I'm not talking about rebuilding

On the contrary, I'd say if you're not re-architecting your apps every couple of years then you're at risk of falling behind. I'm not talking about rebuilding everything from scratch, but making an active effort to do self introspection and ask yourself "we built this app 3 years ago with certain requirements in mind and chose stack X to host it, but a lot has changed in the past 3 years, both in our requirements and in the technology landscape. Should we still be using stack X or does something else fit our needs better?" is unequivocally a good practice.