Animation studios are separate from manga artists. Unless the artists get role and art and story direction, studios might create anime that fail to adapt manga properly.

For example,some change of scenes what an original writer or reader unwant,and low or no profit mergins to original writer.
So,some manga writers do not want to accept about animating.

Mangaka and massive studios like Toei who translate manga to anime risk creative differences.

I hate to repeat myself most popular manga and X antibody Story, parallel worlds rarely won't see anime for several reasons. People didn't like X antibody forms, apocalyptic settings.

Digimon survey in last livestream, people wanted more digital and tech lingo. Closest things we had we had how diabromon was stopped by power of spam email/Denial of service attack.

Problem those in IT have to dumb down terms without talking down to audience, various hacking methods, internet security, malware, literal viruses that can highjack servers and so on.

I've tried my best sending a physical letter to Bandai and email to give advice in writing, co-write etc.

Live action, CGI with help from AI is cheaper than anime with budget in millions and other issues.

Bandai is profit driven and goes with what makes the most money. In case of Digimon, trading cards and virtual pets.

Ghost Game didn't perform well, Applimon failed to hook younger viewers

Vital Bracelet risks sunsetting.

Palworld made it impossible for digimon to compete since it's beating pokemon in popularity.

Digimon needs new blood, appeal to new viewers, most of all innovate.