>>4137836I have an X-T100 with a slip on grip such as in pic related and I find it comfortable to hold. That said I'm not used to deep grips such as found on DSLRs so if you are used to those I'd say most mirrorless cameras are insufficient for you.
But remember that the film cameras we shot for 40 years barely had any grip at all. The tiny slip on I posted would be a massively luxury then and they could shoot just fine.
