Could be.
I noticed that some decent Apple refurbs were available for M3 Max notebooks. To me that means they'd be new, and that new Macbooks are coming sooner than I thought they would.
I reckon a Studio will last much longer than a Macbook. Because they are not moved around, they don't flex, and they run cooler. Plus not having a screen and hinges, and keyboard, and having ports that get pulled in and out, plus power supplies connections that get knocked around, there is less to go wrong in a Studio. But they have fewer and later CPU updates and typically are say ... 18 months behind Macbooks' technology upgrades.
For me I reckon I'd be better off (besides the more sensible PC option) to have a cheap 15" Air, and a Studio. But I'll likely end up with a macbook max of some variety. It'll have a later Apple "deletion via software date" than a longer lasting form factor of the Studio. Which feels bad to me. A desktop should be enable to last longer than a notebook.
It's also ironic that the cheapest computers Apple sells (like the iPad) have the longest potential life. I guess the iPad has the latest generation processor ... but its got the smallest battery life of all Apple products. I guess Apple is counting on its battery being that device's main cause of needing to be replaced.