My concern is that while the iPad is excellent for drawing, it is not a specialized drawing device.
This is important because in theory, Apple could discontinue the iPad for drawing at all, and since some pens are restricted to particular models, and Apple has a history of discontinuing devices if they don't sell as much as they expect.
This is important because when you compare this to specialized drawing companies (e.g, Cintiq), not only is their hardware more widely available and easy to find, their pens also stay on the market for several years – AND, if you instead go for a Windows tablet (as opposed to a specialized drawing tablet), then ALL the Windows Ink pens are compatible.
So, at the very least with specialized solutions, I will have durable devices that are supported for a LONG time (e.g, 20-year-old+ Wacom drawing tablets that STILL work), and/or that have alternate pens that can be purchased, and/or which are compatible with ALL Windows devices.
If you like to draw and use your iPad regularly, there's a high chance your stylus will be dead in 5-10 years, and Apple may have discontinued it by then. Or your iPad may have died, forcing you to buy another and throw away a working stylus.
Even if you ARE willing to afford the Apple tax without complaints, what's guaranteeing you'll be able to use Procreate in 5-10 years? Will it still exist by then? With PC solutions, I usually can grab an old version of Photoshop or a compatible program and use it forever – if only to open old drawings for archival purposes.