Why can't authors write romance without the ntr bait?

Because authors are hacks. There are romance stories out there without shitty drama, so they are not impossible to write.
Has nothing to do with security. Writers want to keep the story "fresh" and "interesting", but the kind of drama OP talks about is just a cliched trope used by unoriginal hacks.

how? beyond normal dates and maybe occasional tiffs what else is there to write about? and how do you make it not boring?

I still believe he did it out of spite because his manga got axed.
He wanted to get back at the readers.

Romantic drama has been doing that for hundreds of years.

muh drama

>makes NTR arc
>literally kills the manga

NTR, not even once

but it's his own fault, the erina daddy issues arc was so bad
nobody asked for this

ltierally all he needed to do was a valentine's arc, it would have brought everything the fans wanted: slice of life hijinks, shipping galore, seeing the characters try difference recipes for chocolate cake etc
it was so EASY to keep up making the story interesting, but nooooooooooooooooo

How to not understand anything of what you read lol

you got cucked

The author said that he though fans didnt wanted erina and souma to be together, not joking