I used to think that - then I did some work with large scale ERP systems and realised that I was wildly wrong. Fortunately I moved into other areas while I still had some sanity.
It's easy to underestimate the complexity of an ERP for even a moderately sized company, let alone one the size of LIDL.
From a long way, and I mean a really long way, they seem straightforward - but get close and they are Lovecraftian horrors.
Remember, SAP is how Lucifer interacts with our world.
A reasonable business case for SAP, I suppose.
Founder here, happy to answer questions.
One area where ERPNext really seems to be lacking is marketing and presentation. You definitely have the features, but I don't think you're doing a good job of showcasing and documenting them, particualrly before I create an account. You try to show those features in Youtube videos, but the production value doesn't seem to be much higher than a private screencast - I'm worried that this kind of presentation actually hurts you.
Another problem is language support. Last time I checked you worked on community based translation efforts, which resulted in experimental international support. May the quality of the translations has improved since then, and of course I could (and did) help, but without proper doemstic language support (german in my case), there's no way I could use ERPNext with our non-tech, barely english speaking staff.
Other than that I've been intrigued for a long time and wish you would not delete free single user accounts so soon (do they still exist at all?) - I tend to try ERPNext from time to time, with long pauses inbetween, and often have to create a new account.
“Distrobutors have large part of their net worth is invested in the stock in hand. With ERPNext, you can always keep a birds eye view on your stock availability, replineshment, procurement and sales.“ https://erpnext.org/docs/user/manual/en/stock
Second, I noticed that the CI build is failing on GitHub.
I do believe they would have gotten more out of spending 500M on an internal team though.