Thank you all for welcoming me!
niemand: Geoarbitrage is something I'm certainly considering. As soon as I finish my on-the-side graduate degree around late summer next year, I'll look more actively for possible opportunities. I think the first three (then four) years professionally were spent quite good here, as I was able and lucky to build expertise in a small topic which is currently (and still will be in the foreseeable future) in high demand which should give me a good basis for the search. In terms of countries, I mainly see two obvious possibilities: Switzerland as pointed out by Lenticularis and working for a tech company in the US with the downside of quite high COL in Silicon Valley as the most likely area.
Alternatively, self-employment would also be an interesting path. The daily rates in my field should give the possibility to reach at least 200K€ annual earnings, but to do this I still need to build more reputation or do this with a more experienced colleague.
wolf: Yes, all in all, a company car is cheaper than a similar privately owned car. In the ~350€ I'm effectively paying, all costs are included (depreciation, gas, insurance, possible repairs, tires...). I had a used, very fuel-efficient private car before that I bought when it was 4 years old, and came out at around the same monthly costs, if depreciation is included. Back then, I drove 20k km privately (including way to work), now it's more in the area of 25k km, as there is no financial incentive to drive less anymore. I like the flexibility, as my schedule is quite tight due to the on-the-side degree, but it would be certainly possible in my area to go car-free in the future.
I would probably need around 100€ for public transit in that case, so savings would be around 250€ monthly.
In terms of living in a low COL area because you can drive a longer distance with a company car - that's only working if the distance is not too high and if compared with living car-free it's probably not economical at all. The reason is that one considerable part of the company car taxation in Germany is based on the distance from your workplace multiplied by 0.03% of the list price of the car before taxes - this adds up quickly.
Lenticularis: I have a similar view on most of your points. Public health insurance is good in case of a lower income during early retirement, but quite expensive for the service you're getting in the accumulation phase when paying the maximum contribution.
In terms of expenses, I fully agree - quite high for ERE. Actually, I didn't feel like my current lifestyle is extreme at all during the last 3 years, as I'm still driving a way too nice car and I'm living in a nice and even a bit too large appartment. Sharing costs with someone (never lived alone) makes this quite easy. With some improvements like going car-free (which is unfortunately not possible before end of 2020) and cutting back on the rest of the expenses after mobility and rent, I could get to around 1.000€ monthly, which wouldn't be too bad in my point of view and would allow me to still lead a quite "normal" life as seen by others.
It's also quite hard to forecast / plan future expenses, as they will highly depend on major life decisions: How does the current long-term relationship I'm leading turn out, will kids be part of the long-term plan and so on. Still, independent from all decisions, I feel like the direction I'm heading into gives me a lot of freedom for different plans, which certainly is a good thing.
Dodo: Thank you very much! However, I'm not Bavarian as you probably expected based on the title of this post, but grew up and still live in your western neighbor state. But I still understand very well who you're talking about
I think I have to start a journal to get a bit more structure in all those topics, as I'm also for example not completely happy with my current asset allocation.