Nowadays your resume has to comply to the Applicant Tracking System (ATS) software. More than half (and this is an underestimate) of resumes are filtered out because of formatting (margins, boxes, ... etc) and font family and font-size before they reach a recruiter who gives it a 3 second scan to see if it is worth his/her time for more investigation by matching key words handed down to them by a hiring manager without necessarily understanding what they mean.

Even small businesses that don't deploy ATS don't consider direct submission as the main source of applications. On LinkedIn there is the Easy Apply option, and I probably applied for 100s of applications using it, maybe one or two applications were viewed. And the others? They weren't even viewed. I mentioned Easy Apply because it notifies you whenever your application is viewed. On companies sites, probably the same is happening. Most direct applications don't reach the recruiter/hiring manager.