I personally think today's batteries are designed to last shorter than previous ones. Yes I know about parasitic drain and that is a thing. I replaced mine at 4 yrs exactly from date of purchase and it was showing no signs of failure. I succumbed to pressure from this forum and I know I could have waited but what the heck, gave me an excuse to get out during pandemic. I also put in an AGM battery. Short answer is do what YOU think is best for YOU.