I don’t think bandwidth – let alone symmetric bandwidth – is the be and end all.

My ADSL2+ line is about 15Mbps down, and about 1.1Mbps up. Video conferencing works fine, with none of the problems you describe. It is a business class package with a predominantly business-focused ISP, costing nearly £40 per month. Until the last few months, there was no fibre spur into the building in which my home is located, so there was nothing better, short of getting a fixed 5G installation from e.g. Vodafone.

Things that DO disrupt my working over this connection: ADSL retraining due to incoming voice calls, overloaded employer VPN services, latency introduced by employer DPI proxies, and having a relatively flat network on my side with no bandwidth management for e.g. streaming media and massive game updates.