It’s not about difficulty, it’s about perception. For some reason players think you need to know what every mob does, routes, comps and be a lead to tank. Probably because of MDI and +30 key pushers content creators. However…
For 90% of the player base, if you run forward with w key and don’t overpull you’ll time your key. Run forward, don’t lose aggro, don’t overpull. That’s all you need to do to tank. If your doing 25’s then you likely already know what to do at high levels so you wouldn’t have anxiety about it in the first place. For the regular 10-15 and even up to 17 tbh you need nothing to tank.