Saw a Youtube video from TI talk about opamp noise and one of the points they made was limit your bandwidth. TI:How to select an op amp based on datasheet noise specs
While I do understand the reason for limiting the bandwidth, I've seen a lot of schematics where there is no input filter. And in DC signals, I don't think I've seen any filter.
Is it good practice to put input filters (passive or active) to any opamp circuit if board space and cost can be neglected ? Or is purely driven by requirements and anything more than what is required (even if the signal looks cleaner) is just "over engineering" ?
A dramatic analogy would be taking a helicopter to the grocery store, simply because you can vs doing the minimum required that gets you there in a reasonable amount of time like car, taxi, bus or walk.