Firstly, the HTC manufacturer won't stick film for HTC phones because sticking film is completely depending on the customers' needs after they buy phones. When mobile phones leave factory, there is a plastic dustproof film covering the phone screen. It can prevent dust and protect phones, but it cannot replace the function of phone screen film. Secondly, people always cherish their newly bought phones. If there is any scratch, the owner will be very distressed.
There is no brand requirement for film. It only depends on personal preference. If you do not worry about that the screen will be scratched, you need not to stick film, then the display effect will be better. Now people generally choose to stick film for their phones out of protection. Whether to choose high-permeability film or frosted film depends on personal choice. High-permeability film is easy to have fingerprints. But the dispaly effect of frosted film won't be worse.
It depends on the personality. After buying the phone, the first thing for some people is to stick film. Although manufacturer repeatedly advertise not to stick film, some people still stick film in order to prevent any accidents while some people do not care. Generally, most screens of android phones are resistant to scratch. So is HTC G14! It is recommended to buy OK8 to stick film for HTC G14 because OK8 is earmarked for G14.