Might happen really easily though. E.g. you install some package which has been compromised, infecting your software product and suddenly all your customer's systems are cryptolocked and you are on the hock for millions of €€€.
Or your db crashes in new and creative ways and your backups don't work for some reason and now your customer lost an expensive contract because critical data that was in your db is gone.
Of course, you can try to foresee every eventuality, but you will indubitably overlook something and probably never make it to market.
(if there's anything Germans like as much as bureaucracy it's insurance)
Professional indemnity insurance
Business interruption insurance
Directors and Officers (D&O) insurance
Commercial legal expenses insurance
nowadays Cyber insurance
I think I might have forgotten one or two...
If you additionally want to avoid being taxed when you sell stock, the entire company, or transfer it to another country, you'd create two UGs, one as the primary company, the other as a holding. That takes 2-3h for both and costs typically around 800€, but can be had for as little as 400-500€.
This is what previous German YCombinator startups have gone with and recommended in the past.
Going one step further, because a UG is so easy to start, banks will refuse to loan you money in the first year, so you can only raise money by selling shares. If you want to avoid that, you can start a GmbH with an UG as holding instead. This will take a month and requires you to sign over at least 12500€ of assets to the GmbH.
Now, what if you want all of that, but you also want a shell corporation to hide the owners and investors? Then you'd start a GmbH & Co KG, where you set up a limited liability corporation, a shell corporation with multiple special classes of stock, and potentially additional holdings. This is what OP went with.
But the GmbH & Co KG setup the poster wants is not needed for limited liability.
You get that with a plain GmbH (or UG), which is much, much simpler to set up.