Your logo will be used in different places. You’ll place it on your site, on your product, on your signboard. Are you sure that fine lines and a gradient will work in all these cases? Yes, it will look good on a big screen or on polygraph-processed media. That kind of logo can be very suitable for your website. Moreover, even for a package… Nevertheless, signboard will show all the disadvantages of the design. That is why it’s very important to make logo adaptive.
Besides all of that, you need to have your logo in vector format. Raster graphics are not suitable for large-area surfaces, such as billboards. When zooming in, you will get a fuzzy mosaic image consisting of squares. No advertising agency will undertake the production of a layout after seeing a file in .psd, or, even worse, in .jpg.