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That is one of the motives of my question. So, he used nothing but entropy on a windows (not lynux?) OpenSSL and never got hacked. I don´t know if BIP-39 words existed back then, or passphrases, or other stuff. The UI of the first ¨wallet¨ was as simple as send or recieve, and the access to it was secured by a password or what? I guess his whole PC was the hardware wallet, never mixed with nothing else.
I don´t know if BIP-39 words existed
No, not even a passphrase for entropy or encrypting the wallet file. Nothing Satoshi ever shipped had a password. The client created a wallet.dat plaintext Berkeley DB records of serialized keys for every address you created.
I guess his whole PC was the hardware wallet
"Hardware wallet" is a marketing term. Nothing about creating a bitcoin key is "hard" (in that it requires special hardware). Hardware wallets are just expensive low-power computers.
There was also much fewer attacks. Bitcoin wasn't worth much of anything. There wasn't much incentive to try cracking keys. Besides, you could mine on your laptop for a few days and earn 50BTC. Even still, people would stop mining because their laptops got too hot.
Of course, the incentive to crack satoshi's keys is higher than ever so the fact they remain safe is evidence that hardware wallets are not necessary.
Bitcoin was an all-or-nothing package until Satoshi left.
Technically wrong; I believe the first GPU miner had appeared before he left.
It's definitely correct for the code that he published, and I think he was not a fan of GPU mining, although recognized its inevitability.
edit: apparently I remember the timeline wrong
I suppose OpenSSL's RNG is good enough since Satoshi seems to still have his coins :)
At the time, there were no alternate wallets, no alternate nodes implementations, or dedicated mining software. If you found a place to send bitcoins to, they were also running the official Bitcoin client. Bitcoin was an all-or-nothing package until Satoshi left.
Satoshi said: "I don't believe a second, compatible implementation of Bitcoin will ever be a good idea."
https://satoshi.nakamotoinstitute.org/posts/bitcointalk/69/
He probably also imagined wallets, nodes, and miner firmwares, RNG algorithms, etc. just that those concepts really didn't exist as interchangable software choices in Bitcoin yet.