It would seem that the ancient Chinese would have had plenty of contact with peoples who used alphabetic writing systems. It also seems like in most places that encountered alphabetic writing systems, they were eventually adopted. So why not in China?
While more could be said on this topic, similar questions have been answered here by u/keyilan and here by u/intermu. For more recent history, you might be interested in Why did Mao fail to introduce an alphabet-based writing system despite saying that he wanted to do so? : AskHistorians answered by u/kill4588 and u/stonecoldmencius.
Hey there,
Just to let you know, your question is fine, and we're letting it stand. However, you should be aware that questions framed as 'Why didn't X do Y' relatively often don't get an answer that meets our standards (in our experience as moderators). There are a few reasons for this. Firstly, it often can be difficult to prove the counterfactual: historians know much more about what happened than what might have happened. Secondly, 'why didn't X do Y' questions are sometimes phrased in an ahistorical way. It's worth remembering that people in the past couldn't see into the future, and they generally didn't have all the information we now have about their situations; things that look obvious now didn't necessarily look that way at the time.
If you end up not getting a response after a day or two, consider asking a new question focusing instead on why what happened did happen (rather than why what didn't happen didn't happen) - this kind of question is more likely to get a response in our experience. Hope this helps!