Routed Access design - vague Cisco's description

While reading Cisco's materials for CCNP ENT about campus architecture, I came across the following paragraph about switched vs routed access layer.

The Layer-2-only access design is a traditional, cheaper solution. However STP, while getting rid of loops, blocks half of the uplinks. Layer 3 design introduces the challenge of how to separate traffic—for example, guest traffic should stay separated from internal traffic. Layer 3 design also requires careful planning. A VLAN on one Layer 3 access device cannot also be on another access layer switch in a different part of your network. Each VLAN is local. With Layer 2, you can have the same VLAN on multiple access layer switches; however, that practice is not recommended.

I can't understand the bold sentence. Why the same VLAN can't be on other access switches? What is the problem with that? I think it is even what many companies do - the same VLAN for example for voice on all access switches. We only need different subnets but it is not the VLAN that has to be different.

Can you please help me to understand this Cisco's definition?