Miro supposedly to be the platform for free flowing of ideas. I think it’s ridiculous you put a cap on characters. Many times I added copied and pasted text boxes just to extend the long paragraphs. 

The same goes for table rows limit. It imposes limits that hinder use cases. Also, if you have a numbered list in a text box, you can't continue in another box, as you can't edit the first number.

I would like to add JSON data structures so people can see what kind of data is shared between applications. A 6000 limit is way too small with all the spaces and special characters. Workaround is to work with a print screen of the JSON file.  Not really user friendly though.

+1 Need free flowing ideas and text limit is large burden and makes platform potentially unusable for this purpose

Just sharing that there’s also this thread which also covers the frustrating and opaque text content limit.  That seems to be the main topic regarding this issue so worth clicking the “Upvote” button there also.