Moving abroad - tax-advantaged alternative to the Holy Grail

Hi everyone, by moving abroad I would have the opportunity to save for the Vanguard Total World Stock Index Fund ETF Shares, so far I've just been saving for the Holy Grail. A switch to the Total World Stock Index seems very attractive to me, especially because of the low TER (0.06) and because it is tax-optimized (no US withholding tax or tax can be reclaimed due to double taxation agreements between Switzerland and the USA). 1) Am I missing something here, so reason