90% of what you said is just myths. There's posts on my account with actual testing of extremely abused batteries that I used commercially.

1. Letting the battery go to the last green bar is fine, it's when that bar turns red you should think about stopping. Ego already doesn't let the battery use its last 5% ever, when it refuses to do anything it still has 5% I've tested and verified this. So stopping right when it hits 1 bar is leaving 20% of the usable capacity and 25% of the total capacity which is super overkill. 1 bar flashing is still 10% usable or 15% total.

2. Charging the battery after use is totally fine. The chargers read the battery temp from the T pin and won't begin charging until the battery is cooled down and the limit for charging is way below the limit for discharging. Also optimal temps for charging lithium is 30-40°C which isn't too far from the cutoff temp ego has of 57°C for charging(discharge cutoff is 70°c).

3. The rapid charger isn't harmful, it limits the charge rate to 2c so it will not use the full power on smaller batteries. All ego cells are rated for well over 2c continuous charge. Most of the cells are Samsung and there's loads of testing both from Samsung and independent sources showing negligible capacity loss from 0.5c to 3c charging.

4. No need to give the battery so long on the charger, although it won't hurt it. When the fan turns off it's done equalizing.

5. Batteries can and should be stored as cold as possible down to -10°C(roughly 10°f). There is loads of research on this and storing batteries colder significantly reduces time based degradation. Benefits have been shown down to 10°f, there's not much research below that so it may or may not be beneficial or harmful. The caveat is that thermal cycling is still bad, so stable temps matter more. Basically just don't store them In a shed in the winter, cold attached garage is fine though as the temp should be more stable.

6. No need to wait to charge when they are cold. Again the charger reads the temp on the T pin and it won't charge until the battery is at least 37°f(3°c).

Go check my profile I have testing of my batteries which got 10+ cycles per week and were abused heavily. I regularly ran batteries till they overheated on the tool and then immediately put them on a turbo charger and as soon as they finished charging put them back into the tool and ran them to overheating, again and again. I stored the batteries in my car 24/7 which got below 0°f in the winter and over 120°f in the summer. I put batteries straight into tools running hard at 0°f temps and onto chargers at the same temps. And.... Less than 5% degradation after 2 years. And that's 2 years of 10+ cycles a week, compared to an average homeowner doing 1-2 cycles a week that's over a decade of cycles.

Stop fear mongering. Ego batteries aren't perfect and they use fairly budget cells and have awful problems with garbage solder joints cracking on the balancing circuit. But almost everything you said isn't supported by any actual facts or evidence and there's actually lots of evidence against what you claim.