They'll probably tone down the lines in post production, along with enhancing other parts of the suit and mask. Remember that for CW, they did not use a practical suit for filming (one was built for a stuntman but never filmed), all of the Spidey shots in the airport fight were CGI. The lack of a face shell is likely for scenes where they need Holland speaking in the mask. I recall an interview where someone was saying they wanted the lower mask to move when Parker was speaking. I presume the stunt doubles will probably wear a face shell.