It's not really about what software X or Y can do on Linux compared to Adobe softs but wether it can open this or that Adobe format with 0 issues.
The graphic industry is all about formats.
Adobe dominates the publishing and graphic design world(ironicaly because of piracy which didnt destroy Adobe but all the small vendors). So a tool that cant open or edit properly the last psd,ai format version... is almost worthless in a professional environment,