In terms of being included as a main part of the game, it’s a hard no from me! It should be kept to arcade mode and online lobbies.
In my opinion drifting isn’t a legitimate form of motorsport. Don’t get me wrong it’s impressive to watch and the skills the pro’s have is phenomenal, but (again, my opinion) it goes against what Gran Turismo is all about.
I absolutely respect that it's your opinion, because as much as I love it I accept Drifting certainly isn't everyone's cup of tea. I'm just interested, purely out of curiosity, why you feel Drifting is not a legitimate from of Motorsport? It's something I haven't given much though, I must admit, since Motorsport has many different avenues, and felt that Drifting comes under the non-racing section as many other no less legitimate disciplines like Gymkhana/Auto-testing, Motorbike Trials or even Demolition Derbies do.
For me, I've always felt GT was about the car enthusiast more than anything with that additional focus on Motorsport as a whole. With the player picking a car of their choosing to then progress through the ranks, tuning and customising to their desire, achieving whatever goal they want it to. Whether that's for racing, drifting, rallying (later of which sadly has felt more of an afterthought as of GTS) or just driving. But I suppose that's the beauty of such a setup, when done properly. It's different for everyone
, so hopefully GT7 can capture that again, as GTS has made the right steps quality wise.
Personally I couldnt care less about drift trials as most of the GTP community used to do actual competitions the same as you would in real life. They should just give us more customization to allow for better drifting experience, like adjustable steering angle and whatnot.
Ultimately, I think this is where it stands to be honest. Whilst I never entered any GTP competitions, I like many used to do the same with mates back on GT5/6, organising our own BDC/D1GP esque etc. competitions in online lobbies. It's more just wishful thinking personally, that more than just Drift trial, or the odd Seasonal Event like GT5/6 had, could be added, as a more dedicated setup towards Drifting. That said, I wouldn't be too disappointed if things stayed as they, as far as Drifting and Gran Turismo is concerned. The community is large and imaginative enough to come up with it's own events.
The addition of the "Drift tab" in car settings in GTS was a step in the right direction (though the response is mixed on whether it's been wholly beneficial). Going forward it wouldn't hurt to include more settings like Caster angle, steering angle or general settings for adjusting Ackerman angle.