You can do that at 1Gbps or below, as long as you use common sense (i.e. don't try and download at full Gigabit speed whilst someone's gaming online) or apply traffic shaping (e.g. Cake or FQ_Codel), or apply bandwidth limitation (either globally via the router, unintentionally via Wifi speed being lower than internet connection speed, or artificially via e.g. Steam bandwidth limit)
I know, I used to limit my routers wifi speed so others in the house couldn't affect my gaming. But now the connection is so fast that no one person can saturate it, can have multiple people trying to download as fast as they can and I can still game with no issues
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