As you said: Thatâd be (unwarrantedly) taking the logic to its extreme.
VWRL is a reasonable, albeit not perfect substitute for VT. TSLA is not. So why shouldnât we compare them head-to-head? As the popular saying goes: Nobody knows what (perpetual under- or overperformance of small caps) the future holds anyway.
Small caps seem to have underperformed by about 2.5% in total over the last five years in developed markets (yes, VT isnât only developed markets, but it doesnât make a substantial difference).
Top 10 largest constituents make up 13.7% of VT and 14.52% of VWRL.
So the share of small caps is small. As will bethe overall difference they make.