Posted this on another thread, but it's worth a mention here too. The introduction of the shoes has made the average finishing times of the entire field faster, not just the elites. The benchmarks often considered solid times are much easier now. This is a list of sub-2:30 but it's the same trend with sub-3:00.
"Here's an overview of sub 2:30 performances at several major US marathons over the past 5 years with * marking first year of widely available vaporflys at the race. As you can see they were just becoming widespread in late 2018, but in all 2019 they were the shoe of choice:
CIM sub 2:30 by year:
2019 180
2018* 165
2017 99
2016 38
2015 36
Grandmas sub 2:30 by year:
2019* 92
2018 44
2017 33
2016 24
2015 42
Chicago sub 2:30 by year:
2019 140
2018* 91
2017 64
2016 56
2015 79
Boston sub 2:30 by year:
2019* 104
2018 22
2017 57
2016 32
2015 84
New York sub 2:30 by year
2019 69
2018* 62
2017 38
2016 42
2015 34
In 2019, in these five marathons 585 runners cracked 2:30. In 2015, another trials qualifying year, just 247 met that mark in these same races. In 2016, only 192. "