4x4 2,4 Ghz increase coverage?

If I want a AP with maximum coverage, in Europe, In some sites say 4x4 radio increase coverage over 2x2 radio.

My question is if this is true or not

In a WLAN with IOT devices far from AP, 4x4 radio increase REAL coverage over 2x2 radio OR NOT?

Many domestic router have 2x2 radio in 2,4 Ghz (but 4x4 radio in 5 Ghz). Only high end routers have 4x4 radio in 2,4 ghz

I owned unifi UAP-AC-LR with 3x3 in 2,4 Ghz but coverage is similar to RT-AX55 or RT-AX57 that are 2x2

For example, XIAOMI...

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