I can't really start pointing out lots of things but higher currency has its own disadvantage to an economy
Let me help you- It lowers their chances to dominate exports since other countries would have to spend more of their own currency in order to buy their goods and this can lead to low demand of their products
- The high cost of goods in the country can make consumers to depend more on cheaper imported goods and this can weaken domestic producers
- Interest rates can be on the high side wiht respect to their currency and it would be a discouragement to startups seeking loans
- Tourism activities in such countries would be low since travelers would consider the country too expensive
- Investment possibilities may see a decline in the country since real estate investors would see that the properties are too expensive, reducing the possibility of Foreign Direct Investments