Why interface-name removed from group?

[pegasusearl]

Hello, I was using clash-verge-rev which uses mihomo and installed new version. When using my old config I got this:

01-10 00:25:40error
The group [WARP_WIFI] with interface-name configuration was removed, please set it directly on the proxy instead
01-10 00:25:40error
The group [DIRECT_WIFI] with interface-name configuration was removed, please set it directly on the proxy instead
01-10 00:25:40error
The group [WARP_ETH] with interface-name configuration was removed, please set it directly on the proxy instead
01-10 00:25:40error
The group [DIRECT_ETH] with interface-name configuration was removed, please set it directly on the proxy instead

Does this mean I can't use interface-name in proxy group, but can use them ONLY in the proxy? Why the change?
Does that mean I cannot specify which interface to use when using it without proxy? Such as DIRECT.

As far as I understand, allowing to use interface-name on proxy group means I can have two ISP, one is stable with lower bandwidth, the other is unstable but with higher bandwidth. I can use one ISP to direct my online game and the other for browsing. And with the change I can't do this anymore unless I used proxy, which will introduce latency in online games. Or did I misunderstand something?

And also, with previous use case, I assume putting them in proxy means I will have duplicate proxies instead of duplicate proxy-groups. Which is more inconvenient to change whenever I get new VPN.

For DIRECT, we have added a direct type proxy that can be customized: https://wiki.metacubex.one/config/proxies/direct/.

As for why we removed customization on the group level, the reason is similar to the deprecation of relay: a proxy should not allow multiple possible outbound methods to coexist, as this would lead to complex resource management problems for link reuse protocols. Previous discussions can be found in #2109.