Add the new exotics to the entire loot pool... not just worse lost sectors.
Making life bars bigger doesn't add fun. Adding champions doesn't add fun. Locking me in to one activity with both of those things isn't fun, especially when there aren't any buffs for me to take advantage of like old school nightfall burns.
And while I'm here: harder doesn't automatically mean more enjoyable. You're bungie, stop trying to be From Software. The feeling I get after doing these master and grandmaster things isn't "YES!" The feeling is a disgusted "-blam!-ing finally."
Which, again, isn't fun.
It"s actually good once you power up they'll be a breeze and, it's actually giving focused loot like chest, boots, head and arms. You now know what you are gonna get and not depend on random RnG which can be painful. It's not difficult once you power up.