"And if I were allowed a moment of frankness, I do not understand the reasoning for such an extremely rigid process."
The process is not rigid; the users simply do not know how to follow the guidelines. I also do not understand what's so hard about submitting the changes along with a source link and/or an explanation, a timestamp, a screenshot, so that the changes can be verified by the approval staff.
"And even when it is allowed through, it tends to take a long time for the title to actually be up. "
This happens because there is a big volume of submissions because of certain users... However, we have brought new staff on board to speed up the approval process. The new staff are currently being properly trained.
"Mydramalist is an entertainment site. It is not a bank, governmental or essential systems database where you get a ton of people or criminals attempting to target the system."
You will be surprised by the number of spammers/trolls/people targeting the site, either by submitting wrong changes or attempting to scrape the information that we and other users/contributors have been working hard on translating/adding/updating/etc. So, while yes, we are not one of those institutions, data is still bringing in money. To you, it might be just "an entertainment site", but to the rest of us and for various reasons, MDL is an important place and must be protected.
"I hope MDL seriously reconsiders its submissions process."
At the moment, we will not reconsider this process, mostly because of what Kate said. Just because someone pays to contribute to the servers' expenses doesn't mean they are capable of submitting/approving properly in accordance with the guidelines.
However, the admins do plan on improving and speeding up the approval process by changing how it works (first step, being history logs) and bringing on more users to help. I cannot say more at the moment, but my advice to anyone who wants to help in the future is to focus on following the current guidelines when submitting and raising their contribution points and ratio. Because no matter the process, guidelines will still be in place, and approval staff will still be around.