if u're all physical carts, region does not matter to u. if u're digital game buyer, then your games will be limited to your region (i.e japan games wont be available in US region which is R1, unless it is localised). for Malaysia region which is R3, is kinda a rojak region, got japan,english,chinese games but also limited, not ALL japan games will be there, not ALL english games will be there. mine is R1, last time R1 Ps Plus gets alot of good stuff, now, still there is but less.

but again, the games (digital) that are not for your region (assume R1), say J-Stars Victory Vs., u wont be able to see the game in your PS Store. and if u're Japan account (which is R2), u wont be able to see, i think Uncharted, SteamWorld Dig, Terraria and so on. but i cant confirm this as i dont have a japan account, but it's close to the real case, so u can safely rely on this info.

but if u're all physical game cart, then its all good nothing about region will matter to u