the recent Jimmy Fallon video showed that there were more new events (either already in the game, just not accessible to us yet or not in a final build).
since GT5 the level of content between when the game released and when the next GT game was announced has increased drastically. in GT5 we only got a few cars and tracks (and as paid dlc), they added seasonal events and the online car dealership. spec II was a year later and added much need quality of life fixes and a cockpit view for the standard cars.
in GT6 B-spec, course maker, a lot more cars and tracks, and the ayrton senna + red bull special events were added, as well as Sierra.
in GT sport, effectively half the car + track count was added since release (the car count doubled from 2017-2020), we didn't even have Le Mans, or tsukuba, or even a career mode at launch.
it's been stated we should expect more tracks, cars, missions and events over the next few years for GT7, and I can imagine if we take the GT7 from 2025 and had that in front of us now this discussion probably wouldn't be happening. I hope there's a big spec II like update soon, where they add a whole bunch of events (a lot more, not just 5/10) and fixes to the lobby system, allow us to sell cars, etc. I think the payouts will not be like how they were in seasonal events (i.e. very high), but there will be a lot of events to give us variety and not make it feel so grindy (i.e. not having to repeat the same race over and over).
it just sucks that we can't expect that to happen at release anymore, but at least Kaz has acknowledged the issues instead of ignoring them like in madden/FIFA (not that that should be the baseline for comparison).