Yo no estoy de acuerdo en que tener deuda global cubierta a euros sea como tener deuda en euros. Cubrir la moneda a euros es simplemente comprar contratos de futuros para neutralizar el efecto de la moneda, pero la deuda real que tienes es las de los paises en cuestión. Otro tema sería si es efectivo o no cubrir esa deuda y los costes que ello conlleva. Aquí se explican mejor los amigos de Vanguard https://www.vanguardfrance.fr/documents/global-fixed-income-tlisg.pdf "Conclusion: consider going global Global bonds allow euro zone investors to diversify their fixed income portfolio through exposure to interest rate movements influenced by a variety of international risk factors. We have shown that the currency exposure of un-hedged global bonds adds volatility to a portfolio and, without aggressive assumptions regarding unexpected currency return, is unlikely to benefit investors over the long-term. With currency risk hedged back to euro, the global fixed income market can fulfil the traditional role of bonds by providing risk-reduction and diversification benefits. While differences in performance characteristics between euro zone bonds and the global market have been modest over our sample, we ask the question: Why not go global? With a potentially low-cost hurdle to exposure and no negative impact over the sample, there is little reason for total return investors not to expand their investment set. Indeed, without a prior view on which bond markets will produce superior performance, the global market can be considered the neutral forward-looking portfolio. With the euro zone bond market representing a relatively small portion of the world’s fixed income securities, we would encourage investors to consider how a global bond allocation may help them meet their broad investment objectives in a strategic asset allocation."