Boot lifespan? Danner Pronghorns not holding up

[Zootownelk]

best pair of boots I had was an old pair of Rocky's- lasted about 15 years of A LOT of upland bird miles and several seasons of western elk/deer hunting. Incredible. I've now had a pair of Schnee's Beartooths for 3 years. Really good until this year when several holes have appeared. Not sure if this is 'normal' or if they're not up to standard. I treat them at least a couple times a year, but maybe I need to baby them more? Looking for new boots now.