I already acknowledged the size increase is due to safety. It's not an opinion that modern cars are physically larger and heavier than they were only a few generations ago. There's nothing to disagree with. The M3 (now called M4) has become an entirely different class of vehicle.
2021 G80 M4 length: 189.1″, width: 74.3″, curb weight: 3,840 to 3,890 lbs
2011 E92 M3 length: 180.4 to 181.8″, width: 71 to 71.5″, curb weight: 3,704
2001 E46 M3 length: 176.8", width: 70.1", curb weight: 3415 lbs.
2021 M5 length: 196.4″, width: 74.9″, curb weight: 4,345 lbs
2010 M5 length: 191.5, width: 72.7, curb weight: 4,012
2001 M5 length: 188.4″, width: 70.9″, curb weight: 4,024 lbs