I figured hashiras will always do that from now on, since I expect them to be present during these battles.
This whole last two episodes is a low for Demon Slayer. The stakes and powers are too vague and obscure to create the tension a battle like this needs. That swordsmith kid would have been a decent addition to the battle area since he's the only side character to get development this arc (protecting him as stakes); but instead is a side-mission for the seaweed hashira who we find out has amnesia as a telegraph for some shocking twist later...
Tanjiro's battle with joy demon was quite a step down from his previous few main battles as it was weakly directed and, again, showed little imminent danger to Tanjiro. Daki was on the verge of killing him a couple times and that entire scene was much more visually interesting. Joy was a retread of the 'death by a thousand cuts' speed demon archetype and Tanjiro's method for faking him out to land a blow was awkward and didn't feel earned or impressive. Shrug.
Agreed that these four split emotion upper demons have been pretty unimpressive so far. Their attacks seem too gimmicky to be taken as a serious threat, suggesting their longevity comes from their hidden weak spot- a boring proposition.
I would argue that the only one keeping this battle somewhat interesting is the shotgun kid by being able to survive death blows by unknown means (demons getting a taste of a human who won't die when 'killed normally' is a fun twist) and is getting a few hits in. Plus his style of sword x gun is a welcome change of pace.
Love hashira took her sweet time getting ready to join the fight, but hopefully next episode can recapture the energy previous seasons had in the headliner fights!