Casa providing support for eth is a little more nuanced than say BTCpay server providing plugin capabilities for shxtcoins.

Btcpay is open sourced and provided zero support for your coin plugin.

Casa has had to develop and support eth as a part of their services.

#[2]​ and team provide great insight as to the decision but ultimately lowering the barriers to transition from shxtcoin to #Bitcoin is good in my eyes.