Some comments from @sipa in #12702.

___

Yes, I think `importmulti` is superior in every way, except:
* Slightly less convenient to use (it requires redundant information, as you have to explicitly state what you want to import, and then give the keys/... to enable that).
* ~Doesn't support P2SH-P2WPKH yet~. Added in #14454

The latter can be fixed by just adding support for that case. The former can be improved by adding 'default' cases (e.g. if you prove a WIF private key, it can permit omitting the address, ...).

{
    if (request.fHelp || request.params.size() < 1 || request.params.size() > 2) {
        throw std::runtime_error(
            "createwallet \"wallet_name\" ( disable_private_keys )\n"
            "\nCreates and loads a new wallet.\n"
            "\nArguments:\n"
            "1. \"wallet_name\"          (string, required) The name for the new wallet. If this is a path, the wallet will be created at the path location.\n"
            "2. disable_private_keys   (boolean, optional, default: false) Disable the possibility of private keys (only watchonlys are possible in this mode).\n"
            "\nResult:\n"
            "{\n"
            "  \"name\" :    <wallet_name>,        (string) The wallet name if created successfully. If the wallet was created using a full path, the wallet_name will be the full path.\n"
            "  \"warning\" : <warning>,            (string) Warning message if wallet was not loaded cleanly.\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("createwallet", "\"testwallet\"")
            + HelpExampleRpc("createwallet", "\"testwallet\"")
        );
    }
    std::string wallet_name = request.params[0].get_str();
    std::string error;
    std::string warning;
    bool disable_privatekeys = false;
    if (!request.params[1].isNull()) {
        disable_privatekeys = request.params[1].get_bool();
    }
    fs::path wallet_path = fs::absolute(wallet_name, GetWalletDir());
    if (fs::symlink_status(wallet_path).type() != fs::file_not_found) {