You seem to only be seeing it from one angle, which is the backing off route and that they wont get rid of you. What about the low hourly of a red chipper? Do you really want to advocate cover to a red chipper who's only making minimum wage with the addition of variance that blackjack inevitably brings? That's why I dont advocate cover to red chippers. Not only will they not bother you, but why cut into your small hourly win rate using costly cover?
Not to mention, there's also a 3rd reason to not use cover, which I have mentioned many times before. If you ever get pegged by a casino, it will be because of you moving your money with the count and not bonehead plays that you make. Surveillance and pit bosses are not trained to look for that as many dont even know basic strategy. The only plays that will stand out for them are splitting 10s and doubling A9, which may raise eyebrows, BUT only if you're betting big at that time or betting much more than you were previously betting. Go split tens and double A9 with a minimum bet out and see if they care. That proves that cover plays are not what pegs you.
Cover is costly and a waste of time. I advocate playing aggressively, backcounting, short sessions, ratholing and only playing shoe games. That's where the money and longevity is, especially these days. Heads up play is over-rated. You dont necessarily get more rounds per hour playing heads up than people think and all you're doing is exposing yourself with huge spreads, which is the number thing these droned out pit bosses and surveillance are taught to look for. Even if you get more rounds per hour, you're playing at a lower edge, SCORE, and higher N0. If you backcount the right way, not only will you increase longevity, but you can get away with higher bet sizes and a higher EV.
It's almost impossible for a casino to peg you if you combine short sessions with backounting, ratholing, and staying within tolerance levels. If you're betting huge amounts over 2x500, then you might get pegged just because of the 'attention' you've caused such as after big wins that will get you pegged on a tape review, but by backcounting you still will last longer wonging in with 2x100 - 2x500 than if you play heads up at 1x25 - 2x500. Red flags will just go off if a pit boss sees you spreading like that. That's why I keep it under 2x250 to also stay within most casino tolerance levels. If you really must play heads up, you should be wonging out aggressively at -1, in which you will only need a moderate 1-8 spread to beat the game handsomely, which will increase longevity and every other metric compared to the heads up play all approach. I try to combine both approaches, but I mostly backcount.