You're framing the Brighton example wrongly, as while they're less money-resourced, they've had a lot more of a more important resource - time - to build that system and become a front foot team. It's a great target for us to aim for, under Woodward we were all over the place appointing polar opposite managers and swapping them out after a few years, there was no continuity. Hopefully we can get a football structure in place to emulate theirs, or at least that operates with foresight and a plan.
With regards to Onana, yes I agree that we're not good at progressing the ball yet, but we weren't going to go from a long ball counter team to a masterful possession team overnight, and it's a big improvement on last season and a crucial step towards being able to build attacks from the back.
The end of last season the team was running entirely on fumes, so I don't think that's a fair thing to point to, especially given that we still got over the 3rd place finish line and were edged out in the FA Cup final by City. As for this season, Wolves was poor, I agree, but that's mostly due to players not fulfilling their duties, and even then we won the ball in dangerous positions quite a few times but wasted it. The first half against Spurs was a much better example of what we're aiming for, but again we were let down, particularly in the second half, by players defaulting to what they know and are used to from multiple seasons gone by. Forest was a terrible start from players not concentrating, followed by a re-enactment of the Alamo where we completely dominated, and Arsenal yesterday was an evenly matched game, away from home against the second best team in the country last season (who were the best for long periods).
I think you're being a lot more reasonable than some of the other detractors on this thread, and I understand some of your concerns, you've articulated them well, but I genuinely think we're putting pieces in place for a very good team, and we need time to see it through. Even if we sacked EtH tomorrow, we'd need to bring in a manager who wants to play progressively, who is also pragmatic enough to evolve the team steadily as we're not fully capable of it yet, so it would still take time.