In this case the P1S without AMS is a better starting point.

Add an AMS later if valuable.

The step up from P1S to X1C isn't worth it for someone with a budget who doesn't need the incremental improvements of the X1C.

Personally, I'd still just get the X1C (and I'm not the person above you).

The price difference is low enough now that I'd just take the upgrade. Sure you don't "need" the better screen, better wifi, quieter fan, and default installed hardened nozzle/gear. But they're nice. And OP will want the hardened nozzle/gear if they're printing CAD designed structural parts - PLA is a bad pick for those, you really need to be in the ABS/ASA/PETG/PP materials, and those benefit heavily from the Carbon Fiber/Glass Fiber additions in the filament (PETG-CF and ABS-GF are fantastic).

Back when the difference was closer to $500, sure - get the P1S. But the X1C is frankly a steal at $799. And if you catch the occasional sale, you can get the X1C + AMS combo at literally OPs sticker price ($999).