A website is like a house. If you don’t have one, you need one. Whether you buy or build, a house fulfills Maslow’s hierarchy of needs; warmth, rest, security, safety.
If you have a house, it’s most likely going to need to be updated at some point. Sometimes it just needs a fresh coat of paint here and there, but sometimes it’s going to need a complete overhaul, especially if it’s not meeting the needs mentioned above.