The motive of competition is a strong driving force behind industrialization. With a lot of alt-Industrial Revolutions that are proposed (sub-Saharan Africa, Song Dynasty, Romans, etc.), one of the main issues (to be fair, among many others) is that there was no competitive market that warranted a need to move out of traditional systems.
While recognizing the fact any form of socialism that develops out of TTL would be drastically different from OTL, it's a commonly held belief among Marxism and its offshoots that a capitalist society is necessary in the eventual transition to a socialist society, for it facilitates the invention of technologies/tools/etc. that provide greater ease to the lives of the working class.
As said by others, the form of socialism that would develop pre-IR would be significantly agrarian and religious in nature, and, turning away from competition and trade, would lack the impetus necessary to start an industrial revolution.