Well, a lively discussion by Helio, Cat, and sam85geo here
Here are some additional reports and problems known concerning the formation of the inner solar system around our Sun.
Examining Initial Conditions of Planetary Formation Simulations,
https://ui.adsabs.harvard.edu/abs/2019AAS...23325509D/abstract, January 2019. My observation. Different computer simulations to create the inner planets of the solar system run into different problems. This statement I found very interesting in the abstract. "However, we find that even under extreme pebble fluxes (2000 Earth masses per Myr) there isn't enough growth to recreate the inner Solar System." Other models reported are using 2 to 4 earth masses for the region 0.7 au to 1.2 au and still have problems reported in creating the inner planets of the solar system as well as timing of the giant impact with Theia to make the Moon.
Constraining the Formation of the Four Terrestrial Planets in the Solar System,
https://ui.adsabs.harvard.edu/abs/2019ApJ...883..130L/abstract, October 2019. “To reproduce the orbits and masses of the terrestrial planets (analogs) of the solar system, most studies scrutinize simulations for success as a batch. However, there is insufficient discussion in the literature on the likelihood of forming planet analogs simultaneously in the same system (analog system). To address this issue, we performed 540 N-body simulations of protoplanetary disks representative of typical models in the literature. We identified a total of 194 analog systems containing at least three analogs, but only 17 systems simultaneously contained analogs of the four terrestrial planets. From an analysis of our analog systems, we found that, compared to the real planets, truncated disks based on typical outcomes of the Grand Tack model produced analogs of Mercury and Mars that were too dynamically cold and located too close to the Venus and Earth analogs. Additionally, all the Mercury analogs were too massive, while most of the Mars analogs were more massive than Mars. Furthermore, the timing of the Moon-forming impact was too early in these systems, and the amount of additional mass accreted after the event was too great."
Can narrow discs in the inner Solar system explain the four terrestrial planets?,
https://ui.adsabs.harvard.edu/abs/2020MNRAS.496.3688L/abstract, August 2020. My observation. I find this a refreshing statement in solar nebula and accretion disk modeling. "Furthermore, the Venus-Earth pair was not reproduced in orbital-mass space statistically. Overall, our results suggest serious problems with using narrow discs to explain the inner Solar system. In particular, the formation of Mercury remains an outstanding problem for terrestrial planet formation models." The 25-page arXiv PDF report link,
https://arxiv.org/ftp/arxiv/papers/2006/2006.02637.pdf
Isotopically distinct terrestrial planets via local accretion,
https://ui.adsabs.harvard.edu/abs/2021Icar..35414052M/abstract, January 2021. My observation. Simulations attempting to create the terrestrial planets in our solar system have many issues documented in the models. The arXiv paper shows simulations with times 1 Myr, 5 Myr and out to 150 Myr timelines. The paper reports on simulations creating planet embryos, not full size planets as we see today in the solar system.
The Effect of a Strong Pressure Bump in the Sun's Natal Disk: Terrestrial Planet Formation via Planetesimal Accretion Rather than Pebble Accretion,
https://ui.adsabs.harvard.edu/abs/2021ApJ...915...62I/abstract, July 2021. Reference paper link, The effect of a strong pressure bump in the Sun’s natal disk: Terrestrial planet formation via planetesimal accretion rather than pebble accretion,
https://arxiv.org/pdf/2105.01101.pdf, 05-May-2021. 28-page arXiv report. My note. The 28-page report as with others show problems in simulations using accretion disks to make our solar system and inner planets like Mars, Earth, Venus, and Mercury. The computer simulation in this paper does not create full grown Earth planets but smaller sizes. The inner disk gas and dust mass is about 3 earth masses, otherwise problems develop for explaining the planets we see in the solar system today.
Reports like these fit well with my post #10 and #12 comments.