No, transport no longer required.
Once you have a good streamer and DAC there will be no use for those FLAC files other than backup in case the wifi goes out.
After a couple years I started to get rid of all my CDs as well.
Thanks for the confirmation. To be sure, I have a CD player. It is a Denon Professional DN-300Z. Handy to have in the system, but seldom used. I doubt it is even entry level audiophile quality. My focus is vinyl anyway. But I still have quite a few CDs.
With my focus being vinyl my current streamers are real-time Linux based built for purpose computers. My first DAC is also entry level being the SMSL SU-1. It will probably find its final place in my RV's system. It has been helpful as I enter the streamer/DAC space. I have yet to subscribe to a streaming service, but I have been test driving each one. I'll pick one before the end of they year...
I have a innuos zenith mk3 streamer which easily rips any CD in 5 minutes or less. However the sound quality of my Jay's cdt2-mk3 CD transport is definitely superior to it, even so they are both connected to the same dac with high quality cables. Meaning no way I'm parting with the CD transport. Obviously we all have different experiences. Hence no answer given here is ever the answer to it all solution. One must figure it out for their specific system and listening room.