Ok, intervention time. Money buys you time with your computer.

A €2000 computer gets you all the no compromise parts. There are no unintentional bottlenecks. With all that head-room above current application demands they can last a decade.

€1200 gets you a great computer with a bit less oomph, It is just lower amounts of quality parts, less ram, less storage, fewer cores. it will run all the software you want, just don't expect too much out of it 5 years on.

€500 gets you a computer that runs today's software for now, but now corners are definitely getting cut. You are getting truly slower, cheaper parts. It is not going to be amazing today and you'll be back to tolerating your computer rather than using it in a few years.

The good news is that sales exist. Lenovo will sell you that €2300 unit for €1600 on occasion. Maybe get last year's top model for a steal. Their promotion emails are worth a subscription.