I dont agree that you still wait. The reality is that (lets pretend you dont need to wait for a vehicle, that changes the whole thing) you arrive at the ride-they write down a 30 minute wait. You ride, walk to your next ride and either walk slowly or maybe wait 5 mins when you get there. At this point, you enter the line for ride #2. As you are entering the line, the person who went through standby on the first ride is just BOARDING ride #1. By the time they ride and travel to ride #2, they are about 15 minutes behind you. You are boarding ride #2 when they are just getting in line. You "wait" 5 minutes, they waited 30 that is not equal. That is not fair, it is nothing but advantage.
By starting your time when you enter the fp line the fp time counts toward your wait, which it should, but you also get to include the time you are on the ride, the time you unboard and the time you travel to the next ride. That is neither equal nor fair. I cant get to TSM and say "no, but it took me 20 minutes to walk here, so I get to skip the first 20 minutes of line". They would laugh at me.
Its not that I dont get that people have complications. We have been cut off from shows because we had to park a stroller and get a child out (and suddenly you might care if you know he has a genetic abnormality and severe hypotonia), we have missed fastpasses because of waiting for a chef due to allergies, we have sat outside the park for an hour because DD didnt believe it was Disney- everybody, whether from a disability or not is going to have hurdles to overcome on a trip. So give some pixie dust but it doesnt mean a large group should skip EVERY line. The proposed wait after would only be fair if they added to the line wait, something like "60 minute wait +7 minute ride + 10 minute walk = 77 minute return. But then it gets too complex and people would bicker about walking speeds.