> and get a lot of hotel shuttles and taxis off the street.

No it wouldn't. Those hotel shuttles and taxies are ideal for anyone with luggage as you don't have to carry your own heavy bags with you. The train doesn't want those people slowing things down for everyone as they get all their bags on/off the train.

Airport lines are a good idea because many thousands of people work at airports and thus don't have luggage. They are also useful for travelers taking a short trip and thus don't have much packaged. However Vegas as a vacation destination is expected to have a lot of people with luggage and less people who are light travelers.

Once tourists drop their bags in their room they should be using transit for every trip until it is finally time to return to the airport.

I agree it's stupid. Relevant video on this:

https://youtu.be/-DAfmFdLIjo?si=wg8inSg84VvXFFLx

"The strip" isn't one place. It's several miles long. It's not walkable for people with luggage. To do what you propose, you'd have to not just build it to the strip, but along the strip, which is a whole different problem. There's not a lot of space to build a rail line there. It would have to be a block or two away at best. And then, well, the stuff on the other side of the strip is now three blocks away. For people with luggage. In 105 degree heat in August, or in sandstorms, or sometimes in snow.