Is it a choice? Most projects I've worked on had times when they became overwhelmed with requests; a queue handles this case, but more capacity just makes it ra

Is it a choice? Most projects I've worked on had times when they became overwhelmed with requests; a queue handles this case, but more capacity just makes it rarer. Ideally you want enough capacity to handle X% of requests within Y milliseconds and a queue to deal with the leftovers, and I suppose if your X is low enough then a fair queue becomes a necessity.