Are lawnmowers built worse than 20 years ago?

I buy commercial grade, 20 yr old Gravely I gave away to a friend still running strong, replaced with a Zero turn Commercial Toro working on third year as great as the day it was purchased, keeps 4 acres cut around the house ......... the stuff at the big box stores are crap no matter the brand.....just like the BBQ grills they are all built out of thin sheet metal and are crap in one season.