Why?

In my opinion, the only advantage the LSx swap would provide is an easy OD auto trans. That's it. I think we're saying the same thing, just for your application (stock 4l60e), it's the most important thing that matters to you.

You keep talking about 'more aftermarket support'; sure, there is way more aftermarket LSx products and companies. However, there is tons of Hemi aftermarket support as well. And the pricing is comparable. An LSx dart is more or less one off, so you'll have little aftermarket support for external engine stuff.