> making it impossible for other models to support their every increasing agent feature set (skills, teleport and remote sessions, LSP, Chrome integration, etc)

I use CC as my harness but switch between third party models thanks to ccs. If Anthropic decided to stop me from using third party models in CC, I wouldn't just go "oh well, let's buy another $200/mo Claude subscription now". No. I'd be like: "Ok, I invested in CC—hooks/skills/whatever—but now let's ask CC to port them all to OpenCode and continue my work there".