Afterwards, license 90 belongs to Naoko Takeuchi, but Toei still has a share in it even if it must be small.
Why Naoko Takeuchi went to see the Toei for Sailor Moon Crystal, if she was 100% owner of something, she could have turned her back, and looked elsewhere.
Let's be honest, it's not the crazy love between Toei / Takeuchi. So there is something that makes her have to go through Toei for Sailor Moon.
Because if I were Takeuchi, I don't like Toei, I will go elsewhere to create the new series. Especially since there are better studios than Toei.
Maybe too protective, for my taste. Because when I read an interview with the writers of season 1 and 2. They had good ideas to exploit and they were ordered to use the manga as a reference, which was a shame.
The changes are certainly due to Takeuchi (the Shitenno for example).
Initially, it was not planned a remake, but a sequel to the 90 series according to Osabu, and Kotono. So from there, I think Takeuchi went on the attack to force the remake and not a sequel.