Altars of Summoning is Destiny 2's newest matchmade activity as part of Season of the Witch, and it requires active participation from all three players. The activity is divided into difficulty tiers, and the highest tier fills up the progress bar in three encounters, but the loot at the end stays the same. However, rather than submitting a Feeble or Robust offering, some use a Tier 3 Powerful offering with loadouts that neither help with ad-clear nor boss damage. As a result, the activity becomes tedious.
Defeating high-level enemies and completing the encounter mechanisms within the time limit is not for the faint-hearted. Although completing a Powerful offering contributes heavily to the Altars of Summoning bar, repeatedly failing slows everyone down. It's better to opt for the easy Feeble offering or, better yet, the Robust one for efficient progress.
Since Season of the Witch launched, the Destiny 2 community on Reddit has voiced their opinion on the impetuous use of Powerful offerings. User u/Floppydisksareop complained about how matchmade players use a Powerful offering even when the team hasn't been able to complete it — highlighting that it's problematic when only a sliver of the progress bar is left to fill.

Another player shared a similar perspective but also mentioned how consecutively losing Powerful tier encounters and not focusing on the task at hand uses up ammo and time. While the Deck of Whispers Major Arcana cards give buffs, this seasonal activity doesn't have Rally Banners to replenish magazines and class abilities. Also, one Redditor said they rush over to the Altar and use a Robust offering to prevent their matchmade teammates from starting a Powerful tier encounter they can't handle.
Complaints about the misuse of Powerful offerings by random players in Altars of Summoning have been around since the start of the season. So, if you just want to get through Altars of Summoning for the loot or seasonal quest, it's best to stick to the Robust offering and fill up the progress bar within minutes.