Absolutely. I believe if you log an email you received with Marketo, then if First & Last name are present we record it. But when you are sending we won't have that.
As long as you share a link WITHOUT mkt_tok in it, if the recipient has never been to your landing pages before then they will not see anyone else's values prefill
That does the same thing, just all editable elements at once, instead of one-by-one. It still won't copy any HTML from outside of an "mktEditable" section