I grew up in (now former) East Germany, and the autobiography of the first leader of my adopted home is literally called 'From Third World to First'.
Though I'm not sure what you are trying to say? I guess you are agreeing with me? Yes, if there are many companies that compete for your services and can put them to productive use, you have a lot of bargaining power in those negotiations. Conversely, where those options are lacking, you have less bargaining power.
Yes, Vietnam started from a fairly low base, but has seen phenomenal growth in the last few decades. See eg https://www.imf.org/external/datamapper/PPPPC@WEO/VNM?zoom=V... You can bet your hat that workers' absolute bargaining power has improved by leaps and bounds.
As a consequence, at https://tradingeconomics.com/vietnam/wages you can see how average Vietnamese wages have exploded over time. (Even if their data only goes back to 2011, the growth is still very impressive.)
Apparently washing machines are a real growth segment in Vietnam: https://www.statista.com/outlook/cmo/household-appliances/ma...
These days around 58% of households in Vietnam have a washing machine.
Yes, in general many people around the world used to be dirt poor. And while things have improved, many of these people merely graduated from 'dirt poor' to 'poor'. But that's still progress, and we are continuing to advance. To future generations, even our richest people alive today will look poor by comparison.