I don't really think of the simpler style of Errant as a "sacrifice", I think of it as "enough for the purpose".
Like, yes, I am fully capable of doing paintings like this cover I did for my partner:

But... you know, I've also made good money doing podcast sketch notes that look like this:

And I'm happy with both of these pieces of work, because they are both appropriate for their function, and it's not a missed opportunity, because there's always another project where I'll have the chance to show off some other facet of my skillset.
Plus... simple art can be showing off too. When you remove detail, your lines need to be extra efficient to get across what things are. It's also very effective for being funny, and one of the things people have always praised about my work the most, is the comedy.
So... I don't think of the simpler art style of Errant compared to a book cover illo as losing something so much as making something with an elegant, limited set of tools that help me have clear storytelling and action, strong humour and a tight schedule. It's not a mess of excessive detail, it's not too pretentious to be funny and it's not overwrought and timid, taking ages to come out. It's a bold, confident comic that I feel proud of.