Yes? Why are you surprised by this? We have DIY builds like this: https://www.youtube.com/watch?v=-tLoiLo5fT8&t=115s

We have Seed signer: https://seedsigner.com/

We have Krux: https://selfcustody.github.io/krux/

We have Passport: https://foundationdevices.com/

We have Cold Card: https://coldcard.com/

Like we have literally so many.