Client Side Ad Stitching

Hi All,
We are new to Roku Development and current developing our first app.  It's an Ad supported OTT channel (ie Tubi/ Pluto). We are now integrating ads into our HLS stream and wanted to ask anyone of any negatives to going down the Client Ad Stitching route?  From what I know the user experience is much better.  Not sure why someone would NOT go the ad stitching route?  More development time??  Thanks in advance  .  RG