Bill wrote:

You're forgetting about the people pushing the wheelchairs.

You're not going to make them wait in-line with everyone else.

At airports the wheelchairs are pushed by airport staff.

Exactly.

You're not going to tie those people up waiting in the security line -
because you'd need MORE of them if you did that. Not a very efficient
use of those people if they had to wait in the security line instead of
walking right to the front of the line.