Your logo is often the first thing that a potential client will see of your company. First impressions count!
Logos can say many things, traditional, modern, classic, stylish, kitsch, cheap, feminine and masculine and so on.
Traditional may be seen as old fashioned, classic is a longer lasting style that will not date over time. No style will appeal to everyone. You need to think about your target audience, their age range, gender and location will all give you an insight into what style you need to portray.
Companies often develop their ideas over many years. For example Nike didn’t start off as a swoosh. The word Nike was included in the logo for many years. It was only once the brand was very well established that they dropped the wording.
If you look at Sony, they have changes the thickness and spacing of their logo over time too. You don’t always need to redesign you can update.
If you have a complete redesign you may alienate your existing customers, an update will often work better. Branding development indicates that you are a forward thinking company, not sticking with the old just because you have it. Move with the times and appeal to the maximum audience that is possible.