As per topic, I just found out that the wall outlet at shower area provided is of plastic material (Johnson Suisse).

Would it be a problem in long run? Should I change it to brass one?

Will it be easy to DIY?

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Any photos? I don't understand what you are referring to.

This. It is made of plastic instead of brass.

I've never seen this before. Maybe others can help you with your query.

Now many silver stuff also is plastic with silver plating.
But why do u want to think of changing it when no issue occur now? Why not only change it later when something happen?
Don't think changing it in future will affect ur tiles though

If it's thick enough and well made enough, usually no issues.

Brass is nicer to feel but unless your shower is somehow exceptionally high pressure, this kind of fixtures is good enough.

No need to change until it breaks la.

Thanks for the feedback. Appreciated.

About 5-7 bar water pressure. Actually it's just that one of the plumber mentioned this particular model is plastic while most on the market in brass, therefore he said "can" change for better and hot water handling, but I am not well versed in this therefore I seek advice.

Eh, it's kind of like saying to buy a Honda City as an upgrade from a high spec Myvi that was given to you for free.

For most people it's not worth the cost when the free version is perfectly fine 😄

Understood your point, and thanks.