I don't really ride hard enough to make a difference. I use sintered metallic on the front and buy somewhat by price, but prefer brand names. The metallics seem to be hard on rotors and noisy scratchy sounding until quite warm. Braided lines and keeping clean fluid make the most difference. I use organic low price on the rear. Organics seem less hard grabbing and make it more difficult to lock the rear. I have never had a bike with ABS. I've also haven't had the V long enough to take it on a fully loaded trip. So our more sporting riders will have their favorites, our high mileage full load tourers may differ in their choices. Compared to the drum brakes we had 50+ years ago just about any disc pads make me happy. This thread will prolly go like an oil or tire thread; many valid experienced opinions, not much consensus.
What brand of metallic pads are you using? I respectfully disagree with a few of your points based on my prior experience.
1) One of the advertised (by most manufactures) advantages of sintered pads over organics is they are more consistent with regard to differences in temperature from hot to cold and also wet and dry. They do not benefit from warm up unlike organic pads, they perform the same cold or hot, and they are less likely to fade with heat. Can't say I've really noticed much difference in temperature but I don't ride that hard although they do grip better when really wet.
2) With regard to feel, the two installs of sintered pads I've had, have considerably reduced braking force at initial application of the brakes (they're less grabby than organic pads) which makes them more linear in feel wrt lever or pedal pressure. Any brake pad can lock the wheel easily, the difference is in how they respond to lever or pedal pressure. I feel this characteristic is especially advantageous at the rear where it is harder to modulate pressure with your foot than hand and thus it is less likely to lock the rear wheel under harder braking. The more linear feel of sintered pads, at least after you get used to them, allows me to brake closer to the limit without feeling I may accidentally lock the wheel.
3) As for noise I have never experienced squealing or annoying brake sound on any bike with any pads. The sintered pads however do have a distinct very faint sound I would compare to a distant field of chirping crickets.
4) Wear, while sintered pads do apparently wear rotors faster they also last longer. I have not noticed the rotor wear to be significant enough to notice wear on the rotors. Whatever pads you choose, the rotors should theoretically last the life of the bike unless riding track or some other unusual usage.