I found out that linux commands are too old and require a lot of effort in order to learn all of them.
Is it reasonable to replace them with new ones?
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Ubuntu has done its best to set GUIs in place of most of the commands.
Other than implementing GUIs, though, replacing the commands with 'new' commands will just be a lot of effort to learn all of them and a lot of effort to rewrite all of them, so the answer to your question is, "No."
Your best bet is not to learn all of them at once, but instead to learn a few of them for whatever you need right now, and maybe some will stick. Then learn a few more for the next task and maybe the first few will come in handy, and so on.