I strongly disagree.

That makes no sense for the characterization of Makes-Things or Techno-Dann's agent self that they'd let DoSAT send out still-broken things or half-assed repairs, and I'd argue that by having that viewpoint and essentially using that in your own stuff, you're putting both of them out of character.

Especially Makes-Things, when you consider that we make a rather large deal of him. For example, from the wiki...

"Makes-Things' skill with machines and technology is nigh-on legendary in the PPC"

"Makes-Things invented most of the technology agents now take for granted, such as the remote activator, the combined CAD, and the DORKS, among others."

And in regards to Techno-Dann...

"Exactly how he distinguished himself enough to be warranted taking over the Department's second-highest spot is also unclear, but if it impressed the Flowers it had to be good."

As a general rule, people who are good at something know it, and they're going to have standards. Saying that DoSAT hands out broken stuff or 'does not work as intended' stuff is pretty much going against Makes-Things and Dann's stated characterizations, not to mention any other technician.

Narratively, I'm personally of the opinion that PPC tech breaks as much as it does because it's poorly maintained by the agents (When's the last time you ever saw an agent treating DoSAT tech with care or making sure everything was working right and up to snuff before they go into a mission?), and used in situations where it is the technological equivalent of staring into the sun for several minutes in the middle of summer with no cloudcover. (No, no, you do not need to point your Canon Analysis Device at Legolas when he's singing along to Nightwish and cutting his wrists and preparing to dye his hair raven black.) The Rule of Funny works better involving PPC tech when yes, it is a PICNIC (Problem In Chair, Not In Computer) scenario problem instead of putting that it was because people who are competent and know what they're doing are giving you crappy stuff because they can't fix it right.

I can't think of many spin-offs where it was clearly a user error than DoSAT mucking up, which is concerning. I can only think of one other than my own, which isn't really impressive. Chatvert has Kitty jump into an ocean with her CAD still on her (no prizes for guessing that it breaks), and has Alec purposefully point another at a massively OOC character to use it as a make-shift grenade. In my own, I have at least one case where July ends up playing hot potato with the CAD because it didn't occur to her to not point it at a normally god-level powered pokemon that has suddenly taken human form, wears anime style clothes looks like a bishonen, and is a woobie uke.

This probably seems to be from out of left field, but I've noticed this viewpoint show up more and more and it's somewhat alarming.

The idea that it's DoSAT that is the reason that your stuff always breaks, not what your agents doing with it, and that -with the suggestion that it's always them- they're so incompetent they can't even do the job that they're assigned to do, is practically a Suvian one. It's something we see in Suefic all the time. The Sue can't do anything wrong or break anything, so if something does go wrong, it's because of background character X or background item Z.

I never said anything about useful spells. I am a big believer that every spell is useful for more than just the one thing that everyone uses it for. You just have to be creative.

The only agent I have that will be doing much in HP-verse is a wizard from that world. She doesn't need a Muggle-Use Wand. Go ahead and use that idea if you like.