Actually, the opposite is true. Look below at the definitions of these words used in this context.
1. "Create" -
verb
- bring (something) into existence.
"he created a thirty-acre lake"
synonyms: produce, generate, bring into being, make, fabricate, fashion, build,construct; More
- cause (something) to happen as a result of one's actions.
"divorce only created problems for children"
synonyms: bring about, give rise to, lead to, result in, cause, breed, generate,engender, produce, make for, promote, foster, sow the seeds of,contribute to
"regular socializing creates good team spirit"
Creation requires intervention. Something or someone has to do the creating. Just take a quick look at every example. There has to be something or someone doing the creating.
2. With development, there certainly is no necessity for any intervention, as the subject associated with the verb is the thing "developing".
Develop, which means to "grow or cause to grow and become more mature, advanced, or elaborate", does not require any intervention, as the subject of the verb in this case is the one doing the developing. (e.g., "the zygote developed into a fetus in the womb"). While the word "develop" can mean "to create a product or idea" in certain circumstances, that is not the meaning of the term when discussing fetal development.
Does this make things more clear? Why did you think that "growing and becoming more mature" would require "intervention", yet "bringing something into existence" doesn't? I'm very confused as to the thinking behind your previous comment.