Are rotomolded coolers actually worth the price over a standard cooler?

Reviewers consistently report multi-day ice retention (often 4-6+ days) from rotomolded or rotomolded-equivalent coolers versus roughly 1-2 days from standard injection-molded coolers. Specialist camping communities generally say the upgrade is worth it for multi-day trips, road trips, or hot-climate use, but overkill for daily beach/picnic use where a soft cooler is fine.