I venture to guess, that this is only pertaining to the actual addition of the detergent at the beginning of the load when the cartridge is used.  However, I also guess that "as well as different times during the cycle", that the Powerspray is used at those  various times during the cycle, but not at the beginning for the purpose of adding the detergent.  I cannot imagine that a powder detergent user would completely negate this unique feature completely, only not used for dispensing detergent and is used elsewhere in the cycle.

Alexander, would you please provide a link to the use & care guide for the dryer? 

Thank you very much Alexander.  Very much appreciate this. 

What I find "intersting" are there's a bit of contradiction in the manuals between the two brands.  Maytag Allergen cycle recommends up to a 3/4 full load max capacity where as the Whirlpool manual recommends load size be only 1/2 full.  the specialty cycles are totally different betwween the two brands.  On the Whirlpool there is a Bulky Items cycle on the main cycle dial for Blankets and comforter and there's also a blankets/Comforters Specialty Cycle.  Therre's a business wear specialty cycle on the Whirlpool that's probably the same as the Wrinkle Control main cycle on the Maytag.  It looks like the Wrinkle Control is almost the same as the Jeans Denim main cycle on the Whirlpool.  wish you could see the description of the std. settings and options available for each of the specilaty cycles on both machines, but that's a separate document not available online.   

Do you think that perhaps what's happening is the same thing that Whirlpool/Kenmore/KitchenAid did? The machine were mechanically identical, but the programming on the machines were completely different? I seem to remember reading somewhere that that was common with Whirlpool. Plus the Whirlpool TOL version doesn't come with that fancy nozzle!

Jamie, I would say that is most definitely the case.  They have to differentiate between the lines.  And of course, the average consumer isn't going to research the nuances of product differences from the same sibblings/cousins.  But when it ocmes to washers, dryers, and dishwahers, I wanna know how "cousins" diffferentiate".  (I suspect the Maytag brand is now what would have been Kenmore Elite feature-wise if Sears had kept sourcing FLers from WP).  There are cycles or options the Maytag has that is either not offered on the WP or cycles are similar, but with either different tumble or spin speesd.  Otherr than the recirculating spray for the Maytag, I also like there is a MaxExtract option for extended spin, which WP doesn't offer in their model, but offers Eco boost instead.  I'll take longer spin over cooler hot and warm water temps.  Maytag also has Ex. Heavy as well as heavy soil options.  Wouldn't surprise me the std. cycle times are a bit shorter on the Maytag comparable cycles vs. the WP ones as John L has indicated, I think he referred to being "dumbed down" a bit.  I"m still drawn to the Maytag version of these vs. the WP because of the nozzle, MaxExtract, I doubt I'd use any of the specialty cycles since I don't have laundry that meets the descriptions, save for Kitchen Towels, and I'd either use Sanitary or Allergen, or even PowerWash cycles for those, depending upon the details of the Kitchen Towels cycle.  Plus, I also like the auto 2 extra rinse capability of the Maytag option.  Plus, I'd be willing to monkey around with the detergent dispenser settings if based upon my water hardness and concentration level of liquid,  turned out to not being to my liking.  I'm willing to monkey around and punch buttons to get the results I"m looking for because I understand all ramifications, but then most typical users would have no clue.  Maytag (and even WP) have expanded the use of the heater, even as an option for Stain treat (steam for stains) for all but teh quickest or most gentle cycles.  that's a far cry from the original WP or even the He3T Kenmore.  That's what I like most about FLers is they have the capability to heat water up to 155 degrees, if needed vs. dumbed down top loaders or even the HE top loaders.  Not sure what I will do if DOE standard force all FLers to do away with supplemental heaters (like SQ doing away with their one model with the heater booster because of future DOE requirements).  I may not always have a water heater like my current WP that has easily accessible temperature controls on top vs. having to remove service panels on typical water heaters.  With that I"m able to control the "hotness" of hot washes in my Fridgemore right now.  (I don't relish the thought of washing whites on top of the stove to get hot water for whites some day).