I honestly don't know what Cessna is thinking
They don't care about piston GA. It's as simple as that. The 172 line (and by default, their piston line) stays open for flight schools.
The RD, tooling, and jigs are there and paid off. So if someone orders a new 182 or 206 or Bonanza they've got the tools and ability to build it. But there's no volume so it will cost a bespoke price. How much does a custom car cost to build? Their a for profit business and figure that's the fully for profit price to have someone hand build a pane if it gets ordered. Engines and G1000 aren't cheap, I bet their actual profit margin is thin on these once you figure $50-$150/hr labor and the fixed costs of materials, avionics, engine.
Where Cirrus still has the "volume" (relatively) they've embodied a fully lean production cycle leveraging automation. In the 1970s I'm sure Cessna did too. But today? It's just easier to keep in in quasi Cirrus price range and charge a one off hand made price. Sure, it's not luxury, but people overpay for Jeeps too because "iT cAn Go OFfrOaD"
Mind you, I hate high wings less than I used to. In fact I've fallen for our no-struct 210L Centurion in the club. What a great and solid feeling plane. Fast, comfortable, great W&B, and just feels like an absolute beast
But there's no reason to buy a new piston plane today. If you want new, get a Cirrus, if you want new that's not a Cirrus, build a Vans. Otherwise for $300K you can buy just about whatever you want on the used market, including 210, 206, 182, Bonanza, all that good stuff.