The reality is it’s a combination of all the things mentioned which explains why you see other “new” teams seemingly doing much better in the past.
-A lack of testing does make it difficult to improve in the middle of the season, especially without much experience in their pocket. Something teams like Jordan and Stewart had back in the day.
-Reliability was definitely a much more finicky beast back in the day. With such a high percentage going out, 6 place wasn’t such a far fetched idea on a rough day. Now reliability is so important that there’s little hope for so many upper and mid-field teams to prematurely retire in one race.
-The new teams are new in a way few “new” teams that have been mentioned were. Even Stewart were bought from Tyrrel if I’m not mistaken. Jordan became Midland which I thought became Super Aguri, but from what Keith is saying, I might have my facts wrong. But anyway, FI came out of Super Aguri, which again does a lot to be handed down so much data, experience and materials.
So although some of the examples given make it seem like these new teams are floundering, there’s a number of situation influences that can make the “old new teams” seem so much more successful.