This is an interesting use case. I will agree, not having multiple remotes paired is a small pain … when one remote can’t be found, it’s nice to have a backup.
Now, that said — using an iPhone as a remote works very well. Built into the phone’s OS, it’s quite seamless.
But I understand where @k2ue is coming from. I do always like to keep a 2nd remote paired and tucked away in a drawer - TiVo and Apple TV both - because they do have an odd tendency to go missing.
Why apple hasn’t added a remote finder function, I don’t know ….. “TiVo does it!”