I consider it as a private transfer and it's dangerous. If you buy a car or a house which is costly, when the tax office ask the proof of the transaction, you won't able to give it. Bitcoin blockchain is transparent, but people who not understand will know nothing.
You will have to register those properties and it requires information and even proof of payments of property purchases. If exchanging Bitcoin is not allowed by law in my nation, I won't do this risky trade.
Especially later if you want to sell your house or car, you will have another issue with tax reports. Nowadays with digital bank transfers and digitalized governance, it's harder to hide your financial activities. So if law does not allow it, I won't use bitcoin for directly purchase expensive, lucrative properties. You will need to cash out your bitcoin very slowly to have enough cash for buying properties you want.