Sennalen

Yes, particularly from 1:08, but he's just trying to get to Minmus. It's even worse trying to set up a tranfer to another planet.

Pull it prograde, zoom out to see where you're going. It's not right, so you try to drag some more but miss by a pixel so it closes the widgets. Zoom back in on Kerbin and repeat. There should be a window with all maneuvers as a list, where you can adjust the dV, add or subtract ETA, move it forward a full orbit, etc. while keeping the camera focused on your target intercept. It's no worse than KSP1, but there at least I had Kerbal Engineer and a porkchop plot.

I'm glad they are making it something specific rather than mystery "liquid fuel". I would have rather it have been UDMH/NTO as the KSP1 equivalent, seeing that matches the properties of being dense, non-cryogenic, and ignites reliably. Also hypergols are still the dominant choice for orbital engines IRL. As long as its moddable, I guess that's okay. Speaking of which, I don't love the statements about keeping the balance similar to KSP1. This would be the time to make a clean break and go for realistic physical values for the engines, then use the size of Kerbin as the difficulty tuning knob.

Have you tested the planet pack with Pricipia out to a late date on high time warp? It tends to eventually run into a problem, especially with Jool's moons.

Is there something that can generate electricity off of the gradient between heat loops?

Getting a kerbol escape trajectory without excessive dV is very feasible using a Jool assist

I like that they are putting thought into the late game, but I hope historical and current-day elements aren't given short shrift.

A reusable SLS is the shuttle, basically. I've seen a few concepts with a little side-mount engine pod separate from any crew or cargo. It's possible it could be given wings and wheels to land on a runway.