No, you're arguing that FISA warrants are rubber-stamped, but if you believe that, you must also believe that search warrants are rubber-stamped, which is the "nonsensical conclusion" I alluded to earlier.
> Seemingly, in a public environment where search warrants and the justification for them is public....
Search warrants and the justification for them are not guaranteed to be public and can be sealed like FISA warrants, and both can and have been unsealed following legal challenge. Therein lies part of your error. The second part of your error is that FISA warrants can only be used to search the records of non-citizen foreigners, who do not have fourth amendment rights, and people who have already been proven to be agents of a foreign power.
So you are arguing that search warrants are always rubber stamped?
Seemingly, in a public environment where search warrants and the justification for them is public, there is great pressure on the judge and law enforcement to act properly. No such check exists in the FISA system.
Think about the lax punishment of Brock Turner and all the attention it received. This is because the miscarriage of justice was public knowledge.
Behind closed doors people behave badly. There are numerous examples of this, including reproducible experiments.