Perks in SV companies are absolutely not frivolous expenses! They are a necessary expense to attract and keep the right talent, in competition with other SV companies that also offer generous perks. If you cut it, morale plummets and you will lose a lot of good employees.
The link you posted contains great tips for assembly-line factories filled with replaceable hourly workers. SV is.. not that.
"The beatings will continue until the morale improves" .... ever heard of that?