Just HP stacking on enemies doesn't equate to an increase in difficulty

[Schan]

I just did the first Shadowbringers dungeon and it was utterly tedious:

• Trash packs with way too much HP, especially considering them only having 1 ability at best
• Bosses with too much HP, especially the last one: fighting for several minutes in a normal dungeon seems like overkill - but thankfully he does hurt if the mechanics aren't played properly

Why to companies think that making a HP sponge being able to soak even more damage equates to an increse in difficulty?

things have been going pretty fast for me. maybe you've been teamed up with bad dps?