True, but most of the import PWM controllers found with these bundles seem to do a fair job, certainly better than the shunt controllers they were selling 10 years ago. Sure a good MPPT controller would work better, but who wants to put a $75 - $100 charge controller on a $110 solar panel.
I have used a few of these for 100 - 150 watt off grid remote applications (remote wifi security cameras, wifi relays, remote gate openers, etc.) in the last few years, and baring lightning zaps, etc. they all seem to work. I have used these kits from Renogy, Newpowa and Eco-Worthy, generally I feel the first two are on par with each other, and Eco-Worthy is a step down in panel build quality (C channel on 2 sides, an L channel on 2 vs the other 2 using C channel all around).
p.s. I have also bought one bare HQST branded panel, which I would rate in the middle, design seemed sturdy enough, but build work was a bit sloppy.
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2002 Safari Trek 2830 on P32 Chassis with 8.1L w/ 400 watts solar 420Ah LiFePo4
2017 Jeep Cherokee Overland & 2007 Toyota Yaris TOADs with Even Brake,
Demco Commander tow bar and Blue Ox / Roadmaster base plates
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