Specifically what functionality do you feel is so critical? The only thing I really struggled with at first was:

- 2FA codes, but a self-hosted Bitwarden and a Yubikey solved that well enough

- Maps. This is a legitimate sacrifice, especially for someone with as poor a sense of direction as I have. But between the mapping application in my car and looking things up before I leave somewhere on my laptop, it's not been a huge problem.