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, ...).

{
    std::shared_ptr<CWallet> const wallet = GetWalletForJSONRPCRequest(request);
    CWallet* const pwallet = wallet.get();
    if (!EnsureWalletIsAvailable(pwallet, request.fHelp)) {
        return NullUniValue;
    }
    if (request.fHelp || request.params.size() < 2 || request.params.size() > 5)
        throw std::runtime_error(
                            "walletcreatefundedpsbt [{\"txid\":\"id\",\"vout\":n},...] [{\"address\":amount},{\"data\":\"hex\"},...] ( locktime ) ( replaceable ) ( options bip32derivs )\n"
                            "\nCreates and funds a transaction in the Partially Signed Transaction format. Inputs will be added if supplied inputs are not enough\n"
                            "Implements the Creator and Updater roles.\n"
                            "\nArguments:\n"
                            "1. \"inputs\"                (array, required) A json array of json objects\n"
                            "     [\n"
                            "       {\n"
                            "         \"txid\":\"id\",      (string, required) The transaction id\n"
                            "         \"vout\":n,         (numeric, required) The output number\n"
                            "         \"sequence\":n      (numeric, optional) The sequence number\n"
                            "       } \n"
                            "       ,...\n"
                            "     ]\n"
                            "2. \"outputs\"               (array, required) a json array with outputs (key-value pairs)\n"
                            "   [\n"
                            "    {\n"
                            "      \"address\": x.xxx,    (obj, optional) A key-value pair. The key (string) is the bitcoin address, the value (float or string) is the amount in " + CURRENCY_UNIT + "\n"
                            "    },\n"
                            "    {\n"
                            "      \"data\": \"hex\"        (obj, optional) A key-value pair. The key must be \"data\", the value is hex-encoded data\n"
                            "    }\n"