Is this broken
Far to obvious, one click instead of more than one, an shopping cart, all too obvious. You are not supposed to be able to patent obvious improvements, the US system is just too extreme.
NOBODY, should have to pay to get an obvious review done. Such reviews should be largely unneeded, as the patenter should be liable to check and patent only an valid patent, and criminally liable for those people that are trying to deliberately slip by an "sly one" fro commercial gain, and the Patent office should be liable to take out proper searches and procedures to largely eliminate patent "mistakes" and invalid patents. Fighting the rejection, or exploration (including hindering) of an patent claim, should be taken as an criminally labile act, unless it is provable or has reasonable expectation/belief behind it.
As an incentive, even an reward could be offered for successful challenges of patents based on claims struck down or modified.
No money should be required to defend an patent.
Also, companies/law firms, that specialise in breaking patents, by finding patents that are owned by individuals, or small businesses, that can't afford to defend them/prosecute unlicensed use of their patents. Should be healed legally, and criminally, liable, with the assets of people/entities involved in these criminal collaborations seized (to the extent of their involvements) and put in jail. With no time limit of prosecution of individuals, and entities that have not changed out of the hands of conspirators.
All this will lead to an higher quality patent database, more patents, and lower cost+higher productivity as an consequence. Some pain, for much much gain.