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, ...).

+ HelpExampleRpc("loadwallet", "\"test.dat\"")
        );
    std::string wallet_file = request.params[0].get_str();
    std::string error;
    fs::path wallet_path = fs::absolute(wallet_file, GetWalletDir());
    if (fs::symlink_status(wallet_path).type() == fs::file_not_found) {
        throw JSONRPCError(RPC_WALLET_NOT_FOUND, "Wallet " + wallet_file + " not found.");
    } else if (fs::is_directory(wallet_path)) {
        
        fs::path wallet_dat_file = wallet_path / "wallet.dat";
        if (fs::symlink_status(wallet_dat_file).type() == fs::file_not_found) {
            throw JSONRPCError(RPC_WALLET_NOT_FOUND, "Directory " + wallet_file + " does not contain a wallet.dat file.");
        }
    }
    std::string warning;
    if (!CWallet::Verify(wallet_file, false, error, warning)) {
        throw JSONRPCError(RPC_WALLET_ERROR, "Wallet file verification failed: " + error);
    }
    std::shared_ptr<CWallet> const wallet = CWallet::CreateWalletFromFile(wallet_file, fs::absolute(wallet_file, GetWalletDir()));
    if (!wallet) {
        throw JSONRPCError(RPC_WALLET_ERROR, "Wallet loading failed.");
    }
    AddWallet(wallet);
    wallet->postInitProcess();
    UniValue obj(UniValue::VOBJ);
    obj.pushKV("name", wallet->GetName());
    obj.pushKV("warning", warning);
    return obj;
}
static UniValue createwallet(const JSONRPCRequest& request)