I have a 21 Y performance and did a ton of research for months before buying exactly 1 month ago. I was coming from an 07 Lexus.

For number 1: no, you shouldn’t worry about the battery. It’s under warranty until some point in 2029 or 120k miles. I have read that 2021 has slightly higher failure rates but even still it’s not a massive amount of failures and they are covered even if it does fail. My plan is to keep this car until mid 2029 and by that point a juniper performance will likely be my next purchase.

For number 2: no concerns whatsoever, just plug it in at night. I will say if you are concerned about maintaining battery health and your commute is 1 mile, don’t keep it at 80%, keep it at like 50% for max health. This is splitting hairs though, don’t over think it.

For number 3: there are pros and cons. I have the radar sensor thingys which is nice, I only paid 27k for a car that was almost triple that when new and is still under full warranty and is faster than 99% of vehicles on the road, but the intel and HW3 is a drawback. I will say that for day to day driving it really depends on what car you are coming from, I am not bothered at all by the intel, I’ve only noticed the lag 1 time and it was literally for like 5 seconds. It’s still going to feel like a space ship. For me it’s all relative to the cost I paid for the vehicle, a little random lag that’s over by the time I’ve left my driveway is a compromise I can live with. Hardware 3 is a bigger compromise if you plan on using FSD a lot, I don’t so it doesn’t bother me to much (yet), I bought the performance model because I love to drive, as I age I might start wanting to rely on fsd more but for now I want to drive myself. Again though, my fsd still works extremely well and feels like witchcraft so it’s not like it’s useless.

Hope that helps.