I went about a decade before buying a new case, and I've got to say building in the new case was a completely different experience and a lot easier. Lots of space behind the motherboard tray for cable management, and 2.5" SSD mounts hidden behind the motherboard aswell. Lots of options for cooling like filtered 120/140mm fan mounts in the front, bottom, top, and rear of the case, and good room for radiators/AIOs.
Your old cases should still work fine, but I would recommend taking a look at some modern ones to see what you're potentially missing out on.