Titans are the main thing making factions unique, as their native techs and their unique stuff on the research tree is ridiculous, nothing much changed from the original race... TEC Loyalist wouldn't be defensive if they had a huge Ragnarov tearing apart anything on it's rampage, and we all know of the titans which are stronger and which not...
For Vasari it would be just LOL as both titans are seriously OP, Advent factions have 2 good titans (Eradica is better in killing fleets though, so maybe it would be the choice more often than not), TEC, Ankylon VS Ragnarov, everyone knows Ankylon is not in teh same league the other titans are in... So basically this change would weaken the Ragnarov and the Coronata I think, as their racial counterpart is (for TEC, much) better.
It is good as it is now I think, it would seriously mess up faction uniqueness, as only Titans are what define each faction the best.
It would make the Advent Rebels and TEC Loyalists more powerful. Would be a huge, much needed, boon for the latter.
AR more powerful if they had a Coronata? Sounds interesting, waiting for the reason.