so just my personal take on all this.. no one cares.. but its the internet so im gonna post it anyway haha..

he makes some good points i wont try to detract from.. lipo chemistry prefers a warmer temp and the rapid charge/dischage thing is a thing.. it will make your batteries have more umph. i think the cost isnt such a thing up front cause discharge banks and that charger are kind of a buy once/cry once proposition.. they will however shorten the life of batteries so if you dont care about spending hundreds every season on the best/newest batteries.. all the more power to you.. if you want to get a couple seasons from $100 batteries.. maybe you wont do this.. up to you.

similarly with motors. i think that 5-6amp rule needs to die.. i hear it all the time, but several motors have come out even since 2017 that kinda differ.. old motors 2016 ect really seemed to work well with this but newer ones have been all over the range.. if you are going to buy the motor checker at all.. every single motor you take out of the box should be tested through its entire timing range beyond 30º i think.. you need to make a chart and graph the rpm/current use and decide for yourself based on your own driving style which works best... higher current draws will typically benefit those who dont know what brakes are i find heh. brakes in stock.. who uses brakes? cant explain this to everyone.....

i think weight distribution is a HUGE deal... car setup and driver is always a huge deal.. not sure how much of a fire i want to se haha...

im not a national champion though. my rc experience is limited to canada.. im sure you US guys are just.. better. one day ill come down there and thrown down.. im sure ill lose.. but thats ok too.
where i live racing means setup/teardown ect so tracktime is quite limited. the people who have access to the unlimited tracktime definitely have a stronger voice.