Taproot will improve Bitcoin scripting capabilities and privacy that is especially important when using multisig and Lightning Network.
There will be changes inside but regular users won't even notice most of them, addresses will be the same bc1 segwit and fees will probably be much lower for multisig.

I don't know what ethereum newton is and I don't care, but Bitcoin has nothing to do with that, it is simple version of smart contract with much less chance of having bugs in code.