I think the guide is great as a whole, but I don’t think the Hsien-ko section is very good. Only one I’ve seen that I felt missed the mark (I’ve looked at less than half of them though.)
As for assist combos, there’s no reason to avoid them, unless your other characters don’t have anything that works, which is the tradeoff you get for whatever else you’re getting. More assists can be used in combos than you might think, from what I’m seeing.
And you generally should get used to calling assists during attacks anyway, so practicing that helps. Can’t expect a combo listing when there are so many character combinations, though, got to see what other people do, like the assist combos that have been posted here, and apply it to your team. If you’re creative, you’ll be rewarded.
Technically there are assist-less midscreen combos besides the default BNB, but they’re usually character-dependent and situational. There’s the secondary aircombo I posted earlier which does slightly more damage but puts you far away at midscreen so it’s mainly useful for carrying people to the corner (launch, M, M, L gong, L, S). For another example, a character-specific one that I noticed today.
st:m: cr:h: :f::h: :rdp::l: st:m: cr:h: st:s: -> aircombo
Somewhat difficult to actually fish for unless you’re punishing something unsafe enough to hit with st.M right in front of you, which doesn’t happen that often in this game unless you x-factor out of guardstun, in which case it could be nice. It only works if the cr.H lands at extremely close range, and even then it doesn’t work on all characters. You can also do point blank cr.H and skip the st.M, and it works on more characters, but it’s even less practical.
Somewhat more practical is this Sentinel-specific (maybe other large characters, don’t know) instant overhead combo:
(jump) j:m: j:m: j:h: (1 hit) j:s: (land) (rejump) j:m: (delay a tiny bit) j:m: j:h: (1 hit) j:s: (land) st:m: cr:m: cr:h: st:s: -> aircombo
Final note, if you’re going to chireitou especially, don’t do j.H in the aircombo. Just do launch -> M M S. The combo will do more damage because of less scaling on the hyper and because you land closer to the enemy. This may be the reason why someone earlier was complaining about chireitou whiffing, or it could just be case of timing (needs to activate as soon as you land pretty much.)
Edit: Oh yeah, while mentioning Sentinel, you can duck under standing lasers, but crouching lasers will hit you (not always though, I think, because of moving hitboxes.) However, you can use cr.H to go under the crouching laser when you see him go into the laser pose. It whiffs on you if your timing is right, not terribly hard.