Users and businesses doesn't care if it's PHP or Node or Rails or whatnot. They want something that allows them to achieve what they want, no matter how custom or complex the thing they need.

Wordpress allows to build very customized web portals at close to zero cost. Zillions of free and pre-existing plugins helps.

If something really custom needs to be created - there are plethora of el-cheapo programmers bidding to do Wordpress stuff for you.