Seed phrase vs private key

32owand61
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Seed phrase vs private key

Please can someone shed some light onto these two concepts. Private key is the actual access to the control of the address. The seed phrase is able to convert the words into the private key to restore lost access. What I don't understand is that the seed phrase can restore access to multiple addresses at once, correct? One seed phrase from one software wallet can restore access to a multitude of private keys. Does that mean that if that software wallet provider company goes bankrupt and the app disappears there is no way to use that seed phrase and restore access to the say 10 coins I had in associated with that seed phrase in that wallet? Can I just use that seed phrase in another companies wallet and it would restore my 10 coins there? What if that wallet doesn't support half of those coins? Is that access lost forever? Or is the process of converting the seed phrase into multiple private keys a transparent one and can be run independently of a software wallet and I can just get an output of all the 10 priveat keys outside of a wallet and use them independently?

Secondly, I keep reading that a private key is 265 digits but when I look at private keys they are much less and not just numbers but also letters. Is this because letters are a short form of writing certain numbers or how come most private keys are only say 50 characters not 265 digits?