I like that it is organized in very clear steps, so there's no confusion about what needs doing next! It also has great templates which makes writing proposals quick & easy with only minor changes required when needed (e.g., dates).
There isn't much room left after adding all sections - this could be fixed by decreasing some section size or allowing more space between elements within each category/section than currently allowed. Some companies don’t want anything outside their own website used as part of any marketing material including brochures etc. This can help ensure that your message stays consistent throughout materials sent out without having something else added later if not approved initially.