Hold on. Some things here are not opinions. If one needed a water in a pan to keep the meat moist then those who don't use water, or don't use a pan - including all the panless stickburners - would never cook moist meat.
Low and slow is not the only way to go. Granted some people are clearly of the opinion that low/slow is better - fine, all are entitled to preferences. However, there are those (fewer in recent years) that say - or at least said - that low/slow is required for tough meats. Clearly it isn't. One might dispute whether high heat can or should be called 'barbecue' - fine again - but it is quite obvious that one can cook tough meats at temps higher than 'normal'. Smokey Hale might well think that 'optimum results' are achieved if the cooktemp is kept below the boiling point of water. In some cases I would agree. But not all. However he and I would agree on this opinion that the results are 'optimum'.
Nothing 'seals in juices' - not searing (okay, this is more grilling, roasting, or pan-frying), not a mustard slather, not rubs.
Another myth: That internal temp (or whatever number) = tender. It clearly does not. Time at temp = tender. We can clearly see this by cooking, say, brisket or short ribs sous vide - at cooktemps of, say, 136 or 140. Which brings up another myth - that rendering does not occur at lower temps. It does. It just takes much longer.
On the smoke absorption and smoke absorption stopping at X temp fronts: Well, it surprises (and unnerves) me how so many 'masters' trot out the first canard, and sometimes the second (though this is mostly relegated to the less seasoned cooks who are simply repeating what they've read too many times to count on the Net). One would think they (the 'masters') have cooked often enough and for long enough and actually observed and learned from their successive/progressive cooks but this is often not the case.
Smoke is made up of particulates of various sizes and volatile gasses. The particulates are easily adsorbed, i.e., they stick to things fairly easily. Particulates do not absorb very easily into fairly dense objects (like meat) - especially when the heating of the object (like meat) is pushing moisture out. This is simple physics.
I recall some well known barbecue guy or another making the case for smoke absorption many years ago on one of the cbbqa pages - replete with diagrams and whatnot - about how cells (like those in meat) in the presence of various things (gasses, particulates, whatever) will 'seek' balance, as it were, i.e., the gasses surrounding the meat in the presence of the meat will seek penetration - to balance things out, sort of like how brining works. Though it sounds plausible prima facie, it does not make sense, not in the scenarios in which the vast majority of barbecuers cook. Unlike cooking in a vacuum (like sous vide), or immersion (like brining), barbecuing (grilling, etc.) is cooking in a draft. Volatiles - being, well, volatile - zip up and out with the draft forthwith. With nothing to contain them - to 'hold' them around the meat, there is no opportunity nor need for 'balance'. Physics. This dynamic may be different in some situations that most of us would not create: for example, slow smoking a country ham, say, in a very low draft, low temp smoking house, for a significant period of time (like many days), might set up a scenario where actual absorption of volatiles is possible (but not, likely, particulates) because of the contained nature of the space and the relatively copious amount of smoke.
Then there are the non-Q-only myths...the Danger Zone top end being 140?, hot food dropping to less than 140 for even a moment needing to be pitched, the 'once the food is cooked it is safe' myth...