Alternative explanation: Most companies aren't global because it's too difficult to be.
That requires to translate/dub the product to other languages. To support multiple currency and payment systems. To have local stock for physical products. To adjust to each country's taxes, regulations and export controls. To market locally to the target audience.
It's very remarkable with tech companies. They try to corner the US market and get billions in funding, before they try to expend to the rest of the world.
I worked for a company that turned down an offer by Walmart to become a top-tier vendor for them. We recognized we couldn't do it in our current form, and would need to rebuild ourselves from the ground up to handle the challenge. Many businesses took the opportunity: Vlassic Pickles most famously became a company 10x as large, but it was a completely different company afterwards, which the president noted was not without certain costs (basically, the family business destroyed, and replaced by being a part of the Walmart supercomplex). Many other companies tried to do the same thing and failed, effectively destroying the business in the process.
[Heh... Walmart as the Gom Jabbar of retail. "They tried and failed?" "They tried and died."]
Most of the comments here see this as entrenched interests trying to hold back the tide, but there are many businesses that don't survive the transition, and many more internal cultures that don't. It's a legitimate business choice to remain focussed on a domestic market one understands rather than gamble on international expansion.
There's a lot of people who want to speak Japanese though. Issues getting money into the country?
There are widespread psychological safety/emotional security issues that effectively sets whole corporates in “deprecated / not accepting new orders” state. Everything is for existing volume customers only, local or foreign.
I’m guessing it has to do with salaries and pension plans; average income is steadily declining, and Japanese retirement plans are long said to go bust at some point. One headcount less when “it” happens should it happen is extra couple bucks to you, one mishaps on your resume is couple grands leaving your hands. Briefcases full of cash from guys you’ve never met is nothing, even if you are told it could save the corporate.
Better late than never I guess.