Question: What do you think is the reason/s why these things are being put together in that particular area and not in other areas?
Answer: You wouldn't keep a frying pan in the bathroom. There is no use for it there. Things are placed in specific places depending on their use and convenience of access. For instance, shampoos are kept in the bathroom because the bathroom is typically the place where people clean themselves. A pressure cooker is placed in the kitchen because you would want an item used for cooking to be in the place where you cook.
Question: In relation to regionalism, what do you think are the factors/reasons that countries are formed into regions? What are the advantages and disadvantages?
Answer: A factor as to why countries form regions are differences in politics, religion, language, and even culture, amongst other things. Yes, even within a singular country, different places can have different ways of living, leading to separation via regions.
For instance, the Philippines has many different dialects, it's one of the reasons you can distinguish between a Filipino from Manila and a Filipino from Cebu. These two people live in the same country, however they both grew up in different regions wherein the lingua franca in each are different.
Also in the Philippines: Mindanao is a portion of the Philippines that is religiously different from the rest. While Luzon and Visayas, for the most part, follow Roman Catholicism, Mindanao follows Islam. It's the reason Mindanao had at one point wished to be separated from Luzon and Visayas.
While it makes sense that these regions exist because of differences in culture within a country, it also means that there's a divide between its people. The advantages to this is that you are surrounded by people like you as well as the fact that the country itself becomes more beautiful seeing as it is not a monolith and there are many new things to be discovered even by its residents. The disadvantage though is that now, there is a barrier between you and people from different regions.