I think some people have hazy memories and/ or misconceptions

Porsche is a very successful engineering company- but they do not in house build all their components. Almost every delay they have is from a 3rd party supplier's QC - the sole time I can think of something going wrong was the E/F series engine. Little bits like the CF door handle or the frunk lid can have big problems for the production line.

going backwards in time for a bit- the 2016 3RS going to 2019 3rs was a radical jump in the aero and suspension categories. 2016 car was still pretty close to road bias. Had huge tires but suspension was really livable. The 2019 car was much more aggressive and their first released vehicle with the full rose-joint/ monoball (all metal no rubber) suspension. This was the key performance distinction for the car. Same suspension for 2RS but we are talking 3rs so I'll leave it out.

The GT3RS in 2016 was 500hp.
The GT3RS in 2019 was 510hp. lap: 6:56

The laptime gets about 15 seconds faster.

The 2022 GT3 (non RS) makes roughly the same downforce as a 2019 3RS. This sends the GT3 into sub 7min territory - officially a 6:55.3


Meanwhile the 3RS went full over 1000lb downforce and added the active suspension controls to the steering wheel. BUT the car only has about 8hp more.

Performance gap increases again -
2023 GT3RS does a 6:49 with Bergmeister and a 6:44.8 with Kern.

so laptimes as a guide to generations:

2023 GT3RS: 6:44.8 (6:49 full track) (520hp)
2022 GT3. : 6:55 (6:59 full track) (510hp)
2019 GT3RS: 6:56.4 (4L, 510hp)
2018 GT3. : 7:12.7 (4L, 500hp)
2016 GT3RS: 7:20 (4L, 500hp)
2015 GT3. : 7:32 (3.8L 480hp)

these factory driver times are all supported by the fact that Christian Gebhart (independent) will go test and run very similar times (3-5 seconds slower most of the time).

So you can imagine how Porsche expects their track cars to evolve. There is usually a handy gap between the 3 and 3RS. The .2 version of the .2 GT3 usually gets close or adopts a lot of the RS stuff then the .2 GT3RS goes another step.

Now the manthey kits have taken these times even deeper- with Bergmeister recently beating the 7min barrier in the GT4RS MR, and the 991.2 GT2RS MR running a 6:38- suspicion is that the 992.1 3RS MR shark fin kit send it into mid 6:30's.

The Manthey kits are suspension and aero only. This shows that HP is not the key tweak the "hybrid theory" people think creates lap times.

Faster laps via suspension and aero and tires are much more in line with Porsche's ethos. The 2019 GT2RS for instance made 700hp and was benchmarked with a Lars Kern 6:47.2 lap. So the ~200hp was only good for 9 seconds vs 3RS. MR kit took off another 8-9 seconds.

992.2 for GT3 and GT3RS could simply keep
down path of aero and suspension development - now with potential Manthey Aero and suspension wizardry for the gains.

also and finally FWIW nobody has come close to the ring times of a 911 except the AMG Project1
and the GTR Black Series, and they won LM24 again with a 911 based car.

Until another recipe starts to dominate, Porsche is not likely to change 911 recipes.