Granted, I haven't been able to watch any of the games thus far, so take this with a grain of salt.
So much of our "success" under Dyche is solely from 1) being fitter than other teams, 2) being able to out grind teams - scraping and clawing for every ball and 3) having a very strong spine of Pickford, JB and Tarks.
Preseason walkabouts aren't conducive to showing any of these 3 points. The whole point is to not get injured, don't go too hard now, try to peak for the season. Our spine has barely played. For example, I saw Coventry's first goal yesterday - that goal simply doesn't happen with Tarks/JB there.
We don't have a lot of quality as is, it's not our strength. Our strength, if we have one, is creating a sum greater than its parts through the hard yards and graft.
So simply due to this, I wouldn't look too much into preseason glorified training sessions. I would, however, expect us to look much better with Pickford/JB/Tarks all playing in the final game of preseason.