Another huge fan of Fusion 360 here. The learning curve isn’t too steep and help is readily available whenever you might need it.
With open source software there is a fair chance that the software itself will become the hobby:
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Think that is rather unfair and a gross generalization. I've used LibreOffice for over a decade. Can't say that Microsoft hasn't messed with the Excel interface, can we? Remember the ribbon? I've used git for configuration management. I remember the horrors we had to deal with using commercial CM tools like MKS. FreeCAD has had some changes, admittedly, but so have other CAD programs. My wife has been using gnucash to manage our finances for more than a decade. It works. I use Octoprint a lot - it's open source. It works for me.
The generalization you made is just as unfair as saying: "Autodesk will always screw their customers... Because, they always have in the past - multiple times."
Will Fusion360 allow you to do FEA for free? FreeCAD will. Can you do assembly for free? FreeCAD can. How about computational fluid dynamics for free? FreeCAD can. (I'm trying to learn that.). Does it integrate with a PCB design tool? I used FreeCAD to help me design a PCB in KiCAD. I had the files generated by FreeCAD and KiCAD sent electronically to a PCB fab house to make PCBs for my Electronic Lead Screw. All with open source. The PCB required no rework, it was a first pass success. I designed the case for the PCB in FreeCAD and 3d printed it. Been using the ELS for over a year.
Your statements remind me of the same old FUD (fear, uncertainty, and doubt) that Microsoft used to denigrate Linux. Now Microsoft offers a way to install linux and have it coexist with Windows.
Open source isn't bad. Some of it is quite good.
Some stinks, but that's the same as commercial offerings. I've spent real cash on commercial software only to find out it's awful. It looked like it would do the job, but it was fatally flawed. And you are stuck - you can't do the work with the product, and you are out the money.
An advantage with open source is
YOU could fix some things that are wrong, if you wanted to, by changing the source code. I've done that. You can also contact the developers to see if there could be changes. I've done that, and had a change within a day. I recompiled FreeCAD and tested the fix. Kind of doubt the F360 guys would give you that kind of access or service...
There are superior commercial offerings, no doubt. They ought to be superior, since they have cash rolling in.
But that is not to say all open source software is bad. There's some really nice stuff out there, if you are willing to try it. If not, it's your loss, not mine. You expressed your opinion, and I beg to disagree. Overall, I've had a very positive experience using open source software.