One of your answers is begonias do not go dormant. Next answer is, allow the plant to go into dormancy. ????????????
Begonias Good Go Dormant or Not?
Whether you can grow a begonia indoors depends on which type you have. Some need to go dormant to trigger the bloom cycle for next summer. Many are not very attractive indoors as their preferred growing conditions are difficult to match. Proven Winners discussing the different types and how they perform as houseplants. https://www.provenwinners.com/learn/overwintering-begonias