It's something that you can see in modern secure: there is multiple points of action active at the same time (contesting left side, contesting right side, contesting middle when it pops), and even if people wanted to split, which I've tried doing, you can never be sure if you're actually going to get uptime out of it, because sometimes you decide say, to go contest the left side, and you capture points there, and there is nobody in the opposite team to deal with, so it feels like I'm wasting time. But more often it's the opposite, you have 3 people on your side and 10 come you way, so your only option is to get the heck out without doing anything. Only middle is generally invested enough that it will see actionable action to happen no matter what.

All of those mass pvp modes have a very hard time accounting for that when they try to split up forces through diverse mechanics on different locations all happening at the same time. It leaves a little too much freedom to players which ultimately results in choice paralysis in the case of RW, and imbalances in the case of FL.