Dexiang Pang

Hi all, I am currently renovating my BTO unit which I din opt for the HDB flooring. I am doing homogeneous tiles for the living room and vinyl flooring for the bedrooms. I realised my ID has actually placed a transition strip between the living room tiles and the bedroom vinyl. She mention that it is necessary, however this is the first time I seen this. So wanna check with you guys whether you have experienced this before. Thanks!!