It will get a software update and will charge faster in no time.
This is certainly possible, especially if the reason for the slow charge is that the cells were rushed into production so fast that Tesla didn't have time to characterize them, and don't know what charge conditions will damage them. On the other hand, the 4680s have been in production, in one form or another, for quite a while now, including in Model Ys which show the same slow charge performance, so it's also certainly possible that the cell quality is such that they can't be fast charged without damaging them, regardless of software tweaks.
Yes. Nio's cars can both charge and swap the battery. They can swap between 75 kWh, 100 kWh, and 150 kWh packs, all of which have the same physical dimensions. The 150 kWh pack is a new semi-solid state battery chemistry and only adds an extra 20 kilos of weight versus the 100 kWh pack:
https://carnewschina.com/2023/12/17/nio-et7-with-150-kwh-sem...
That design is likely the only one that would really work with a "change the battery chemistry" option. All other electronic vehicles seem to use the battery ad the base of the car in a sled design, so updating the battery would be a 10k kind of affair, if possible.
Except for older Model S cars, which received an update a few years ago that massively reduced supercharging speed.
Or, you know, just don't submit the post after writing it unless it really adds something to the discussion.