Overall, since gold has value in any currency (and is sort of the ultimate reserve currency), why would anyone want to currency hedge it?
Because gold is (mostly) priced in USD. You currency hedge it to avoid currency risk and be exposed to only the price risk of Gold in USD.
Hedging it doesn't mean "less speculative". It just means you won't take currency risk.
EDIT: Responding to OP's questions in comment
what happens if the USD drops in value versus other major currencies? Do you think that the gold price in USD would not be affected by this drop in dollar value?
Use the ETF $GLD as a proxy of gold price in USD, the correlation between weekly returns of $GLD and US dollar index (measured by major world currencies) since the ETF's inception is around -47%.
What this says is that gold may or may not be affected by USD movement. It's certainly not a one-way movement. There are times where both USD and gold rise and fall simultaneously.
Isn't a drop in dollar value fundamentally currency risk?
Per Investopedia, currency risk arises from the change in price of one currency in relation to another. In this context, it's referring to the EUR/USD movement.
The bottom line is that, if gold price in dollar goes up 2%, this ETF gives the European investor a way to bring home that 2% (or as close to that as possible).