The 1981 version of wallet is mainly for miners and newbies,Experienced people can continue to use any other version of the wallet.
As long as sufficient handling fees are provided, the transfer is still unimpeded.
Is it true that the handling fee for other versions of small transfers should be set manually and cannot be less than 100IFC?
yes.
At present, the wallet of 1981 version is used in the miner's pool, which means that no miner is willing to pack a transfer with a transaction fee less than 100.