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Say you have a 3x3 AP and three clients.

Without MU-MIMO, one client can receive three spatial streams per time slot.

With MU-MIMO, three clients can each receive one spatial stream per time slot.

However, the total link capacity per client is still the same over time. So what's the benefit of MU-MIMO?

5

This might answer you question.

When MU-MIMO becomes available, the antennas should be more relevant. While a single client with one or two antennas would not be able to fully utilize eight spatial streams offered by an 8x8:8 11ac AP, it’s possible for several Wi-Fi clients to share a larger pool of streams and antennas, so that overall aggregate throughput improves for the client population. Early demonstrations of a single-stream 11ac radio, mounted in smartphone prototypes, have delivered approximately 220Mbps in a fairly challenging environment. The faster the handset can transmit its loads, the better its battery life, because faster devices spend less time transmitting and more time “sleeping.”

Source WHAT YOU NEED TO KNOW ABOUT 802.11AC

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