Plus, they are just a single AA in each controller. Swapping takes like 30 seconds. I use NiMH rechargeables and just swap between a couple of pairs of them whenever necessary.

These use integrated batteries and does full on inside out tracking on each controller, each controller having its own snapdragon 662.

They also do not list how long the controllers last, not found any source mentioning that yet, which is a huge red flag.

Controllers do full on inside out tracking, each controller being equipped with a snapdragon 662.

They also do not list the battery life anywhere, which is the biggest red flag.

It's not a red flag. No console list the battery life of their controllers as they usually last a long time.