Arsenal fans really shouldn't think it's a 'given' that they'll challenge again next season. Yes, they are an excellent side with consecutive 80+ point campaigns and a near 90-point one. Also, their football is indeed less intense than ours under Klopp, which reduces the risk of burnout.
However, don't underestimate the mental side of things. They have been close twice now and have no trophies to show for it. They produced a near-legendary second half of the season only to lose out by a point to a side that's apparently not as good as before yet still gets 90+ and the title. We have to assume that the cheats will again be 90+ points next season.
Arsenal have only hit that mark once? in their history in a 38 game season and that's because it is a really hard target! Many things have to go in a team's favour to get there. Next season, Arsenal may strengthen but there's no guarantee that whoever they buy will play well or be a good fit. There's no guarantee they won't get injuries to key players. There's no guarantee that key players will continue to play to a high standard for a whole season. Players are human and the likes of Rice and Saka could go through a bad patch which may prove costly.
Also, Arsenal's game of control comes with a trade off; they are reliant on scoring first. They aren't particularly good when conceding first, and that's something they need to improve on to win the league IMO. Tbf, they are very good at scoring first, and I think they only conceded first in 8 league games which is phenomenal. However, by my count, they only won 1 of those games and lost 5. (Correct me if I am wrong).
In a nutshell, a title challenge next year is not 'guaranteed' at all. It is more likely than not but hardly a sure thing.