You really haven’t been reading the threads in this forum of late, have you?
First of all, most Guardian Druids aren’t really all that concerned about how Guardian Druid is doing right now, in patch 8.3, because we are literally on the cusp of a new expansion. As far as we’re concerned, this patch is pretty much over. Guardian Druids aren’t going to change prior to pre-patch.
Secondly, Blizzard can buff Mangle and Thrash all they like - that isn’t addressing the underlying issues at the base of the spec, issues I suspect that a level 11 Troll Warrior wouldn’t understand. For instance, the lack of a slow, magic damage mitigation, spell casting, tank identity, etc., etc. Guardian Druids are only doing OK at the moment, and this largely because of azerite traits, essences, and corruption effects - all of which will be going away come SL.
On the matter of the buffs you mentioned: do you realize why Blizzard implemented them in the first place? It’s because Guardian Druids were not doing OK - they certainly were not “Strong.” Those buffs are band-aid fixes, sad attempts to patch up the sinking boat that is Guardian Druid. Guardian Druids have been underperforming all BFA - hence the buffs, and they’re likely to fall back down to the bottom of the barrel come SL without some sorely needed attention. The time for band-aid fixes, patch ups, and crutches in the form of new systems is coming to an end. Something has got to change. The underlying issues need to be addressed, or this is just going to be an ongoing buff/patch up cycle.
My advice to you, Mr. Troll, is to do your research first before opening you big yap and tangling with the bears - unless you like your uninformed opinions being mangled and mauled to death unceremoniously.