The OP makes some interesting points, and there’ve been some excellent responses in the thread. There are definitely some questions of consistency regarding healing (and, indeed, resurrection) within WoW, and broader inconsistencies when it comes to large-scale RP events. These are inevitable - there are many different perspectives on how health, healing and convalescence work within WoW, and how they relate to the mechanics of the game, largely down to the inconsistencies in lore.
All of that said, there are a few things I try to keep in mind when doing healing RP (which I’ve been doing in WoW for over a decade now). The first is the perspective of the ‘healed’ character’s player. When it comes to an RP-PvP campaigns, this is particularly important. As others have said, the action is truncated - a wound which might normally put a character out of action from one weekly event to the next weekly event can mean missing the entirety of the campaign - and in my experience very few people want to go to the trouble of coming along to a campaign only to sit out the lion’s share of it. And then you have healers having to sit out of the same events the convalescing are missing, in order to RP checking in on them every once in a while.
And the decision isn’t taken in isolation. Someone knows that being wounded means they’re missing out on the rest of the week’s RP? Five gets you ten, they just won’t be wounded - or everything will be a flesh wound. The emoted combat which would previously have led to at least some healing RP no longer takes place at all, adversely impacting the experience of all concerned.
The other side of ‘time’ to keep in mind is that a lot of the triage healing takes place while actual healers are trying to spam mechanical abilities to keep people alive. If the best they can manage is a simple “By the Light, be healed!” inbetween ability spam, more power to them - the best I can manage for emotes when healing for realz is macros, and people get tired of the same emote every few seconds.
When given my choice, my approach to healing RP is not that dissimilar to yours - if it’s what the player of the person I’m healing wants. If my character’s a magic-focused healer, magic is for patchwork in the field, keeping people upright long enough to win the day. Afterwards, when there’s leisure to emote properly, there’s proper healing - surgery, application of disinfection unguents or poultices, potions and antitoxins, all that jazz. And when RPing someone who’s being healed/convalescing, I give the healing a reasonable amount of time to settle in (to be fair, I’ve done that to the best of my ability this campaign, missing out on one event due to being blown up by a noodle cart - thanks, Pandaren ‘freedom fighters’ - and emoting the character carrying wounds from previous days impacting her abilities the next day, etc).
But I’m not rich enough in alts to write out my character from a campaign I want to take part in. I don’t want to deny other RPers the chance to carve a chunk off my character in the field (since she’s sure as Uther’s right teste trying to carve a chunk off of them). And I don’t want someone who RPs a healer to feel they have to babysit the sick and injured throughout the campaign if they don’t wish to.
All of that said, if someone wants to RP that experience? Go for it! The differences between healing time and convalescing time between healer A and healer B can be as stark as the differences between Fetching Ingredients for This Here Potion and Wave the Light Around that we see in quests. Perhaps the blade that struck your ‘slow-healing patient’ was rusty or infected or touched by dark sorcery. Perhaps the person being healed just doesn’t react well to certain forms of healing magic, or the poison on the enemy’s blade is resistant to magical cleansing. Or perhaps they just got hit in just the wrong way, and everyone who was healed quickly was hit in just the right way.
Anyway, just my two cents.