Thanks! Good question. I think the main downsides are:

- installation takes a few more seconds to do the checks

- you need to trust me, a random person from the internet

- if there are any subtle differences between pip versions, the checks may be done for different versions than will be actually installed (I've done my best to prevent this for pip versions 22.2 to current latest), or if I missed any bugs, you may get an error you wouldn't get with pip

The current version is also interactive only - requires user confirmation, though I'm open to adding a non-interactive mode in the future.