Why do the docs not mention adding "bridge" as its own tagged interface when doing a VLAN trunk?

RouterOS Beginner Basics
3

Awesome thanks! But even in that link, the provided switch.rsc file only mentions the bridge with regards to the management VLAN (99) - shouldn’t the other VLANs have the bridge as a tagged interface? Or maybe (probably!) I’m still not understanding something.

# egress behavior
/interface bridge vlan

# Purple Trunk. L2 switching only, Bridge not needed as tagged member (except BASE_VLAN 99)
add bridge=BR1 tagged=sfp1,sfp2     vlan-ids=10
add bridge=BR1 tagged=sfp1,sfp2     vlan-ids=20
add bridge=BR1 tagged=sfp1,sfp2     vlan-ids=30
add bridge=BR1 tagged=BR1,sfp1,sfp2 vlan-ids=99

Thanks!