Your point is definitely true for the psuedo-occupied countries like Romania, Poland, the DDR, etc. though. My point wasn't to defend the USSR but that we need competition to drive progress.
For example now the EU has almost none of its own industry - Concorde failed, ARM was sold (and the UK left), there is no equivalent to Big Tech. There is almost no competition (literally the only major examples I can think of are AirBus and Volvo/VW/Renault, and then some industrial ones like ASML and Nordvolt).
China poses more competition because it's chosen to actively protect its own developing industries. So they do have Baidu, WeChat, Bytedance, Huawei, Xiaomi, etc.
I'm also not sure about an EU-led world - the EU isn't even democratic in its current form (the Commission makes most of the decisions, and there are no EU-wide elections). I think it's best if we don't have any leading nation at all but true competition.