If you're obseesive copulsive and anal-retentive like me🙄 , then I recommend that you type your secondaries.
I am obsessive over everything, so i scanned all of my secondaries into a PDF file and then I INDIVIDUALLY created text boxes on the page. Yes, It took a really long time to format everything, but it looked really pretty and presentable when I was finished. I just couldn't bear to see half a page written and part typed. I like uniformity and organization on the page, but maybe that's more just for my sanity (or insanity, depending on how you see it).
I don't think it really matters, but I can tell you that at my interviews they photocopy your secondaries and give them to the interviewers, and from your seat, you can kind of see what papers they have. I recognized my secondaries sitting from a distance. So, if you're comfortable with these interviewers seeing your handwritten application and then seeing you and putting a face to that handwritten application, then handwrite it. I felt better thinking that they thought I took my application serious enough to take the time to type out everything.
Maybe this is similar to the whole idea of spellchecking and proofreading your essays?
I don't know. Do what you are comfortable with. I did not feel comfortable with handwriting my secondaries, so I scanned and typed out everything.
Remember, others here also received interviews even if it was handwritten, so I am assuming it's not that big an issue. Just remember to double check everything.
If you do handwrite it, it looks more uniform if you photocopy the page after it's been filled out. It has the exact same darkness of print throughout the page if you photocopy it after you've filled it out (but then again, that's just my compulsive side talking again).
Good luck!!!