Do you believe that company's name, should always be written as part of its logo and that a logo should not be only in graphics? Why?

Well a logo is mostly used as a branding image, if your company is pretty new, or say not many of them know about the company then a logo can be the best way to get the presence. It still depends on the characters of the company name. The small the better to be used for a logo, if it is a big name then I suggest to use an alternate with which your marketing department should be pretty good in branding.

Overall a best logo can give your company a brand which can be shared on Social Media to improve its presence.

Hope this helps.

Yeah! you are right, name of company should reveals in the logo, but we can design and apply graphics to the font in a way so that people can be easily know the name of the company from logo :)