As someone who is sometimes spelling impared, I appreciate the spellchecker built into Pro, but I often use dynamic text in layout title blocks. If I've misspelled the name of a layout, then the dynamic text using that name will be incorrect and a PDF could be exported with a big bold misspelled title.
This could be solved by having catalog items be spell-checked, or have the spell checker work with dynamic text in a layout, or perhaps as an option on any exports. I thought I could integrate into an export tool but didn't see a spell checking module in the default python environment.