It's possible that using high quality templates in your project to give it visual interest might make your project more "engaging" for your stakeholders, giving you a competitive advantage. Templates can raise the perceived professionalism of your project: The same way that a suit might make you appear more professional when going on a job interview, the use of project templates can make your project appear more professional.
The main factor in any offer is that how capable it is in attracting the attention of your customers. Imagine that you can create as many offers as you want in a matter of few moments. Since they are ready_made in such utilities and are prepared by industry experts, so there is no need to be worried about using them in your proposals as they'd be apt to lend that professional touch. After having downloaded a tool like this, you'd be able to make use of various features that come bundled in it. For those who are not really comfortable with writing content, these tools act like saviors. You get prepared content and only a few changes here and there are needed as per the theme of proposal that is to be presented by you. Templates for proposals could as well be downloaded from the Net but for this you would need to do extensive level search so as to get the best.