You are not entirely right, we need to compare technical characteristics either in the game or in real life, I start from the characteristics of cars in real life. So, in real life the performance of the GT-One you fear is not even close to the performance of the LMP1, I'll explain why..
1 - Firstly; According to estimates from specialized publications and resources such as "mulsannescorner" and "racecar-engineering", lmGTP and LMP cars of the late 90s and early 00s had an approximate aerodynamic ratio of 3/1, this indicates a downforce of about ~900kg and is logical that with the same regulations, these indicators were approximately similar for all participants, no matter GT-One or CLR or R391. Here's a short clip from the MC:
"In general, the cars of this era were pretty downforce-light to start, especially in Le Mans configuration. Looking at data for the open top Nissan R391 LMP900, this is a car with between 2000-2500 lbs of downforce at 200 mph.Intriguingly, according to Mercedes-Benz, in a post-warm up crash press release, attempting to reassure that their cars were viable for the race, indicated that the dive planes they would be using in the race added as much as 25% more front downforce. Assuming a 45/55 split, 2000 lbs total, 900 lbs front, 25% gains you 225 lbs of downforce and is certainly within reason. Rebalanced to 45/55, and you've added as much as 500 lbs to total downforce. But ultimately it goes back to one thing, how absolutely little aerodynamic downforce the cars that were racing during this era had."
And this with a weight of about 900 kg, and a power of about 600 hp, adjusted for the handling characteristics of the engine, from this we can easily conclude about the effectiveness of LMP-GTP of those years. This is the first.
2 - Second, the LMP1 cars I was talking about in my comparison were the 2014 R18 and 2011 R18 and Toyota GR010. The aerodynamic quality of LMP1 cars, and specifically the R18 MY11, according to the above-described specialist engineers RE and MC, was no less than in the ratio 5:1, this is an abyss compared to the GT-ONe, and this against the backdrop of similar power and weight, with better engine controllability in the R18 , a more advanced gearbox, etc., there’s nothing even to discuss here, the LMP1 prototype will simply destroy the TS020’s lap time, no matter whether it was ’98 or ’99 (after all, these are basically the same cars, just with different EoT tolerances). It makes no sense to compare the LMP1 prototypes of 2014 and later years with the TS020; this is the level of Renault Logan and AM Valkyrie.
3-Third, speaking about comparing the latest generation GT500 with LMP1 prototypes, just look at Sam Collins’s reviews on PE, it is clearly stated that class 1 GT500s go at the pace of private LMP1s of recent years, and sometimes even caught the time of factory LMP1 hybrids on one lap, and taking into account the above performance difference between the TS020 lmgtp and LMP1, I think there is no point in hoping that the TS020 will be faster than the modern Class1 GT500.Just for reference, modern GT500s generate more downforce than GT1-LMGTP prototypes, albeit with a little more air drag. According to manufacturers, a class 1 GT500 car has ~1200kg of downforce at a speed of 200kmh, the internal combustion engine power of modern GT500s is around ~700hp and this with a fuel consumption of 95kg/h, the GT500 uses purely racing engines with technologies equal to Formula 1 (SPCCI, TJI and etc.), and modification of the engine is allowed 2 times during the season, this is unthinkable for modern motorsport. The base weight of the GT500 without taking into account the “ballast of success” is equal to 1020 kg, combined with impressive downforce, advanced and powerful engines and tire wars, where tires are specially prepared not just for each specific racing team and track, these cars become very fast, and despite GTA's ongoing 3-year cycle of measures to reduce the speed of the GT500, these cars are still the fastest "sports cars" on the planet, including faster than the current LMH and LMDH, which, having an advantage in top speed, cannot beat the GT500 cars in lap time on the Fuji track with its huge straight, you can imagine what a difference it will be on a track like Suzuka where cornering speed is even more important than on Fuji... And yet the GT500 class 1 cars in GT7 are not next to LMP1 but next to CLK-LM and TS020, that's the whole paradox...