I'm all for more capacity as long as there is no weight penalty. With more superchargers (which are being added all the time), the need for increased capacity becomes less important. Most of the time extra capacity is being hauled around and is not used or needed. The only downside of less capacity but more superchargers is time spent charging. For trips one or more of the charging stops may not be needed. Also less on board capacity reduces vehicle weight and cost. There is no perfect solution.
I am not an owner (yet) but do look at a 350 mile trip I take several times per year. The optimum supercharger midway of the trip is undersized (at Bethesda-Montgomery Mall) and usually has a wait (hard to sell to the SO that the 5.5 hour trip in an ICE will take 8 hours in a Tesla). An 85 will most likely make it with one charge stop, with just enough reserve if I have to use an alternate charging location. However with a 70, unless I am guaranteed that limited midpoint Supercharger is available, I need to make 2 charging stops.
I've done many trips from NJ to NC.
Yeah, Bethesda is definitely the worst supercharging spot I've ever seen. I went there one time, just to check it out. Never, ever, never never never will I go to that location again. I wish I could delete that charger from the list. It probably took me longer to get from the highway to the charger and back than it did for me to charge there. Only 2 stalls in a busy parking garage. Tesla store has vehicles there that may or may not be charging, so potentially only one customer stall available during the day. Completely pointless location.
So, personally, I would suggest not counting on Bethesda.
Woodbridge, VA is OK. It's a little more off the highway than I'd prefer, and during busy traffic hours that's not much fun. But at least it's 8 stalls and in a location unlikely to be ICEd. Probably south of where you want to go from NJ since you're considering Bethesda.
Newark, DE is usually pretty good these days. Only 4 stalls, but a lot of people who used to need to charge there to make it to Glen Allen, VA tend to skip it now it seems. I rarely see other Model S there. Odd because I find that location to be one of the most convenient, literally in the middle of the highway virtually zero miles out of the way.
Hamilton, NJ is probably too close for you to really make work, but you could almost definitely make Hamilton, NJ to Woodbridge, VA nonstop in an a 70 with 100% charge. Definitely in an 85. The I-95 traffic jams actually come in handy for increasing range... lol.
Overall, the superchargers make the travel experience pretty pleasant and I definitely prefer them to quick, expensive, and smelly gas pumping stops.