They guarantee spot rate to dollar for every transaction - so businesses never need to take that risk if they don't want to.

They are mandating that merchants must accept it as a means of transaction though.

The president said last night, in a Twitter spaces group, that they, the government, are offering a free wallet that will instantaneously transfer bitcoin to USD to any merchant that doesn’t want bitcoin exposure. He clarified that there will be no obligation for merchants to use this government funded wallet.

The big thing IMO is that taxes won't be due on capital gains for Bitcoin. This could potentially drive foreign investment?

There are services that convert to fiat currency on the fly, no risk to the business. With the caveat that I have no idea if they are available in El Salvador..

it's more of an issue when economic actors around you don't operate in the same currency

I fully expect people to keep USD on the side, it's already part of the culture all over Central America