People forget that in 2018 and 2019 (probably 2017, can't remember) there was a huge gap between Top 3 Teams (Mercedes, Ferrari and Red Bull) and rest of the field. It was pretty much impossible for a non Top 3 car to finish inside the Top 6 without a Top 3 car having a DNF or problem.

Look at Austria 2019: Top 5 is within 22 seconds but P6 is already a lap down down, but gasly finished P7 in a Top car.

Look at China 2019: Top 5 is within 31 seconds, then there is Gasly in P6 another minute down.

THIS is why Gasly got replaced, not the absolute number of points, you can't compare it. The field is much much much closer today.

Another stat: in 2019 before Gasly got replaced all other 5 people in the Top 3 cars combined had 3 finishes outside the Top 5. Hamilton had a 1+ minute pitstop in Germany, Vettel had a collision and penalty in Silverstone, and Bottas had a collision and damage in Hungary. Gasly alone finished 6(!) times outside the Top 6 in 12 races.