While my T778 is going to the repair centre, I've now setup my 203 as my AVR.
It can do almost everything that the T778 can do, except for the turntable input, and no direct streaming capability - although it seems I can use Roon to achieve this. And there is no eARC functionality, so watching Netflix/YT/etc. from the TV is a bit of a manual process, but I can probably get around this with my Harmony remote.
The sub output level also seems to be not very strong from the 203, as the sub is not coming on when it should. If I run a test tone to wake it up, then it keeps working. But if there's enough of a silent spell, the sub goes on standby and doesn't kick back in, unless I manually intervene. But the workaround is to just leave the sub permanently on.
The sound quality to me sounds just as good as the T778.
TBH, I'm struggling to justify why I would want the T778 back...