My opinion, is that if you are using it as a tow vehicle, then its a concern. If you never tow anything, dont worry about it.
New Chevy Silverado's (1/2 ton pickup) come with a 4 cylinder. They cost less than the V8, have sufficient power for almost everything except towing heavy loads, then you need the V8. The 2.7 liter 4 cyl, tho pretty much "snubbed" by the people who mostly buy trucks, will tow 9500 pounds and has 430 foot pounds of torque. Its my opinion both the 4 cyl Silverado, and the 4 cyl hybrid Sienna have been unfairly criticized by "old schoolers" that insist on having big motors.
Someone raced a third generation V6 Sienna against a 4th generation 4 cyl hybrid, and the hybrid won in 0 to 60.
The Sienna hybrid has an electric motor (also) which contributes to the hp, and, significantly, electric motors get their power now, while Gas engines need to wait until 4000 or more RPM to achieve the max hp. So, the Sienna hybrid "comes off the line" very very well against the V6 ICE engine.
If "horsepower" is important to you consider a Corvette. However, like many/most Sienna owners, we want to be able to haul many people and or cargo, and get 36 mpg, and are not concerned with taking her to the race track.
I have a 2023 Sienna and have found the hp to be adequate for all my needs, "except", I can not reccommend a Sienna for towing other than extremely light duty towing. Dont use it to tow your camper. You will be disappointed towing a camper up long hills (you will likely also be similarly disappointed with a V6 for towing heavy loads up long hills. ).
Its perfect to get groceries, and I have used mine for several trips (a total of 8400 miles) and have no issues with horsepower. I do have issues with Toyota not getting my second key, and, trying to find a new or almost new 4th gen Sienna for MSRP or below. Im tired of having almost 50 grand in a car, and will be selling my 2023 XLE all wheel drive still under warranty and new condition soon for money reasons..I just dont need to have a 50,000 vehicle to haul 7 people when I have no children at home, and can get by on a 2024 Trax that has heated seats, heated Steering wheel for HALF of what the Sienna costs.