The market requiring more efficiency in the areas of LED lighting, server farms, gate automation, battery chargers, vending machines, etc. is a widely known fact.
Besides the marketing driven requirements, many standards impose higher and higher efficiency targets.
This lead to a great revaluation of the LLC (and in some cases LCC) resonant topology in the last few years.
See a comparison between LLC and LCC here.
All the major active components manufacturers on the SMPS market have therefore developed controllers allowing the realization of high efficiency converters with low EMI emissions, with a particularly low circuit complexity.