Are you then trivially going to monitor you're not breaching any tax reporting thresholds in 155 countries, register for VAT MOSS in one of the EU countries, implement IP geo-location for your European customers to make sure you charge them a correct VAT out of 27 options, and then personally do quarterly VAT MOSS submissions?
You don't know what you're getting from Apple for 30%. Which is fine. This is Apple's gross mistake that you and others are not aware of the benefits they get.
Why assume what I know and don't know? Stripe and several other providers offer all of this for a much smaller fee. Plus, I already have all of the infrastructure running on the web, so the incremental cost to support iOS will be close to 0. In fact, even if you put aside the processing fee, not having to support Apple's terrible payments and subscription system will be a net engineering benefit.
If you're using Stripe, you need to make sure you charge the correct tax, and it's your own responsibility to report it correctly in the countries that require it.
There are services on top of Stripe that can do that for additional fee (e.g. quaderno.io), but then again, it is worrying that you're not aware of your tax obligations taking worldwide payments via Stripe and also that you're not aware of what Apple provides you for 30%.
Not knowing either is fine, but I'd say both are Stripe's and Apple's faults that you are not aware of this.
why is Apple spending nearly 50% of those App Revenues on the App Store? You can’t do a good job at App Review alone for Stripes fee, and App Review is critically important for developers and customers.
You are completely clueless if you think payment processing is even a tiny fraction of what the App Store provides.
You don't know what you're getting from Apple for 30%. Which is fine. This is Apple's gross mistake that you and others are not aware of the benefits they get.