SWTOR scales their content every expansion. It can't be that complicated if that ghost of a development team can do it. As for currency. Meh, not worth it. Hunts are faster. Only reason to do some of the roulettes is for EXP and even then its not really worth it most of the time. So ya, the rewards from roulettes are meh.
Also, no one is saying all skills should be dumped on you at level 1... That's dumb. They have in fact however been taking skills away over the years and moving them to later levels to keep ability bloat down. Pre-level 30 content wasn't always just a single button for most classes/jobs back in the day. All I'm saying in that regard is if they don't want to do scaling and let us keep our skills then they need to work on redesigning progression through the older levels. Start introducing abilities earlier so the jobs feel more alive instead of feeling like empty shells even at level 60 and introduce traits that upgrade them to the higher level version later.