1) no, if you want ascension its because of the extra mana meaning extra regen through mana tea. However, Chi brew allows more burst healing and ends up being more regen if used close to on CD. Both power strikes and chi brew end up being better then Ascension.
2) Use mana tea on CD whenever you have 2 stacks and are below 90% mana, not only when you are low. Unless your spell selection changes with your mana level (it shouldn't, be as conservative with 100% mana as you would be with 10%) the only difference between using it "now" and using it later is that you have 8% less mana to work with.
3) While correct that they are cheap, efficient and a decent heal. They can be annoying to place and unless you severely under gear the content you are attempting, there is no reason to run around placing healing spheres under people.
4) This is the only thing that you've said that I actually agree with.
5) EH if you aren't full health, not if you need chi. Thats what Jab is for. If you need chi NOW and you are in melee (which you should be, even if you dont keep the melee buffs up, jabbing for chi is to reliable to ignore) jab is the way to go. Next, both RM and EH incur a GCD meaning there's no way you have 2 chi in 1 second and chi wave out in the next.
Okay, I'm not sure where where you're getting most of this information, but it's pretty wrong, not only that, but you're argueing with someone in almost full PVP gear, with a completely different style of healing, or at least a modestly different style. You should be looking at his gear and his progression clear before you pass judgement on the guys healing. OP asked for BOTH styles.
Ascension VS. Power Strikes is completely preferential. I switch between quite a bit, and I find that using power strikes is quite a bit more volatile in terms of chi generation. They do give you the added benefit of dropping the extra chi on orb form. The talent that you use, Chi Brew, is essentially a situational CD to get a free enveloping mist off, or two uplifts. It's not that good. The Chi can easily be generated otherwise, and using a button over complicates the rotation even more. That tree of talents is really a personal preference, you'll get plenty of those as mistweaver.
2. You should be using Mana Tea ON COOLDOWN.
Getting 6 stacks+ with the glyph on is not good. You're behind on mana, and it will take a while before you can clear your mana stacks considering it's a 10 second cooldown. If you're ending a fight with mana tea stacks, you're not managing the button well. Rule of thumb, as long as you're not
3. Completely wrong. There are so many fights where this can be easily used as a tank cooldown, and it saves on extreme amount of mana if your tank does it right, and consistently uses them. You stack the three orbs, and if the tank is low health by the ad/boss, he can simply side step and gain 90k health at least. It's fantastic, and it's virtually mana free. Blade Lord Tay'ak is another great example of where to use these, as healing as a monk requires you to be standing still and gaining chi. Last phase you need to be running and healing, and this will free your running up a ton. Simply spam these in front of your dps, and expect them to walk on them, if they aren't they should be.
4. Nope. it should be used to combat consistent aoe damage. 19k mana cost is pretty high, and it's a big overheal and mana dump if you're using it wrong. Chi wave fits this perfectly. Chi wave is the thing that needs to be put on cooldown, as it's a great tank or raid heal (slightly erratic, but the heal is solid from it, considering it bounces 3-4 times as a heal). Works best on melee though. Also, to save on mana, thunder focus brew should be used towards the end of the hots falling off, so you can refresh them with an uplift.
5. I didnt start using expel harm until I realized how mana efficent it was considering the free chi it gives. Don't hesitate to use it to gain chi if you are in absolute dire need of throwing an EM or Chi Wave out, and you can't fit a jab into the rotation.