modes

[sour lion]

not enough players to split queues;
also scrims already have the function youre describing a 4v4 queue would have

[muted ruin]

there is so few players like half the time as a ledgend rank player im facing iron's

[sour lion]

also if you want some general warm up for your scrim; do some pugs
warming up for a scrim feels strange to me because scrims are meant for testing stuff, warming up, or getting better chemistry but if you need a 4v4 warmup you can always hop into pugs (ofc youll likely not be in the same team constellation as your league team but its still warmup)

I adressed that in my message

scrims are what your purpose for a 4v4 queue would be