Companies can’t be competitive, nor reach sales goals when prices are artificially high. Similarly they also lose sales to neighbouring countries - making price consistency important.
Despite it not fitting the evil megacorp narrative, good business requires prices to follow the currency changes - but not super tightly as that’s also harmful to business and consumers alike. Each company establishes their product margin and excess to that is not desirable - lost sales are invariably more costly than a small % gain in margin.
The other issue is that currencies usually drop quickly but recover slowly, it takes time to undo the instability in the currency and then attract investment to strengthen the currency. In the case of Turkey it’s due to their recent decisions to lower interest rates despite soaring inflation (the opposite of good fiscal policy). This will absolutely prevent any kind of bounce happening and psychological barriers to the currency have already been passed - meaning the currency (and with that the population) is likely to suffer further.