Up to 2019, Macbooks had ac 3x3 MIMO wifi. Since then, they have ax 2x2 MIMO.

If you have a nice wifi 5 AP, let's say Unifi nanoHD, you get better speeds with the older Macbooks (I had slightly gigabite, with 80 MHz wide channel and three streams). With the new Macbooks, you need wifi 6 AP to achieve similar performance (MCS 11, OFDM, 80 MHz wide channel, two streams); otherwise, with Wifi 5 (MSC 9) and two streams, you get theoretical 866 Mbps max.