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The compatibility principle to which Bitrix, Inc. must adhere to made it necessary to perform a large scope of work not directly intended to develop Bitrix Framework. It immediately affected the speed and quality of development of the platform itself and implicitly affected the distribution of the company’s products in the market.
Actually, the new core is a new development method. At the same time, all old API continues working in the product. And a new API is added for development in a new style. Gradually the old API must become something like an adaptor that ensures compatibility. And all logic with relevant refactoring must move to a new core.