I don't think it's reckless, given your long term horizon.
I am on the same boat, also aiming for the long term. Roughly 50% VWCE and 50% cash here.
I suppose you are aware of the many pitfalls of ETFs - crippled compounding, no offsetting losses, inheritance tax issues, etc. Still, I tend to accept the drawbacks in face of the many positives, also taking into account that maybe ETF taxation will be lowered or simplified over time.
Here is what I am considering, by order of preference:
* Invesco's alternative to VWCE going forward, for the lower 0.15% expense ratio (ISIN IE000716YHJ7)
* Allocating maybe 15-20% to conglomerate stocks for the more favourable CGT and long term compounding, mainly Berkshire Hathaway (even though it's 30% Apple) and potentially Merkel.
* Investments trusts also for CGT