Perhaps composing the BEST response isn't the right tradeoff vs being available for your friends and not leaving them hanging? A person I'm close to does this

Perhaps composing the BEST response isn't the right tradeoff vs being available for your friends and not leaving them hanging? A person I'm close to does this (takes days/weeks to respond to anything). Important as they are to me, I've basically written them off as someone I can rely on.