Well, according to the rumors concerned, the need to connect WhatsApp Web with WhatsApp on the cellphone will no longer apply. Thus, using WhatsApp on several different devices such as desktops, laptops and cellphones will be easier because you don't need to re-connect to your cellphone every time you switch devices. Nevertheless, because it is still limited to rumors, as summarized by KompasTekno from The Next Web, Monday (07/29/2019), it is not clear how the feature will work later.
Please note that there are security reasons behind having to connect a smartphone to the desktop when using WhatsApp Web. All messages are bound to the user's telephone number and are only stored locally on the mobile, not on the WhatsApp server. Therefore, WhatsApp Web needs to take messages via cellphone. This mechanism might need to be changed if you want to apply the features above.
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