However, your argument that the Nano S Plus shouldn't be bought because it's untested can be used for any hardware wallet or any piece of equipment that is brand-new. It can't be tested before it's developed and released to the general public. So, I would like to expand on your thought process and say that you shouldn't buy any new hardware wallet by Ledger, Trezor, Passport, (insert company name), for at least a few months to a year to give those who know what they are doing enough time to test it and try to break it. Those who can do it themselves, even better.
I have the right to say what I want and I have valid reasons for my claims based on experience with their previous models of this company, especially model X that is very similar with upcoming S plus model.
I also don't recommend buying upcoming Coldcard mk4 that is not open source, and I even said similar thing for other hardware wallets, so I don't need to repeat that every time.
This is Ledger topic so I am speaking about ledger devices, and rushing to buy brand new device from whatever brand is not some I would so myself until I see some reviews.