IPoE not support multiple users as compare to PPPoE.

IPoE doesn't support Username Password Authentication.

https://forum.huawei.com/enterprise/en/pppo...read/595816-863

Agree on all the downsides you stated but ISPs here use PPPoE because it was the most compatible accounting method that would directly integrate into their existing billing and customer record management systems. In the case of Unifi, TM is paying the price for this decision in the form of constant capacity and hardware upgrades to the PPPoE access concentrator/BRAS as each of these devices need to handle 60-80k concurrent PPPoE sessions per zone on average.

The other reason is security. Security policies such as unicast reverse-path forwarding to prevent IP spoofing is easier to implement when all your customer traffic is isolated within a PPPoE session. IPOE requires all your devices on the access network to be DHCP aware and to filter incoming traffic based on the DHCP lease that was issued to the client device. Your DHCP relays also need to assign IP addresses on a per-subscriber circuit ID basis (see DHCP Option 82) rather than by MAC address to prevent lease exhaustion attacks (remember, if you're not doing CGNAT you're issuing public IPv4 addresses here).

It's also more difficult to achieve all of this when you go with a multi-vendor (Huawei/Alcatel/Fiberhome) and multi-access technology (GPON/VDSL2) deployment.

No managed IP direct MetroEthernet solution? Maxis 10G backhaul to where?