I really like the 4Tec 2.0 myself. It's well made, durable, has lots of optional upgrades (adjustable links, sway bars, droop screws), but the best thing about it is the adjustable body mounts. It's very cool that pre-drilled bodies from HPI, Vaterra/Losi, etc fit on the 4Tec without having to put additional holes in the body. I also like that you can adjust the wheelbase ever so slightly and that the rear trackwidth is actually narrow, so if you fancy running deep offset wheels you can without having the rear of the car be wider than the front. If you want to run a square stance, you can just use deeper hexes on the rear to even it out. You're right though, it's a heavy pig for sure
Now that you mention it, I think you're right. I don't think any of the brushed RTR kits come with adjustable turnbuckles. I know most, if not all, have upgrades but then that goes back to depending how much $$ one wants to spend.