Well, I'm not a Tech Diver. Sounds "technical" to me, with TriMix, etc. Personally, I'd go nuts on a Deco. I've read all the books, and the advantages of not getting narced sound good. However....there is the other side, more and more gear.
I've seen both sides of the LDS. First, in your OW, you want to copy the instructor. I am working on my instructor cert, and the LDS I am working with goes out of their way to get what is RIGHT for the customer, with no pressure. The LDS works on repeat customers, by treating them right - ALL THE TIME.
As for the newbies, sometimes you don't even know the right question to ask. I know I didn't when I started (and sometimes still don't). I absolutely agree that a diver needs to dive the best gear they can. With that good gear comes a comfort level in the water. Beyond all else, if a diver isn't comfortable at depth with their gear AND their skills, problems can happen. Worse, they may give up the sport.
However, I see way too many divers all decked out, and they have very poor skills. I see the same thing on the ski slopes, too. Fancy gear doesn't equate to skills. Some people don't want to know stuff, and don't take pointers very well, be it ego, poor attitude, whatever. We can all be better.
But it seems from the posts, that everyone is blaming the LDS for what they perceive is going on (selling a lot of tech gear to beginner divers). Perhaps the customer is insistent on what they are to buy, or simply misunderstood the information they got. Maybe the customer ultimately wants to get Tech certified, or cave certified. Who is to say?
I do know when I bought my first set-ups, I made some mistakes in gear choices. I bought stuff that was okay, but I mixed brands in reg/octo, and the LDS I really like didn't service that brand. Also, I bought too low end, as I was buying 5 setups for my family. I don't like the idead of renting on a trip, as I have had some not-so-good experiences with rental agencies at dive sites.
For anyone buying gear, it is an investment. If you have good gear, dive with it often, and you will get good at it. However, a C-card does not a diver make. It's the STARTING point of diving. Learn to nail your skills, have perfect buoyancy and buoyancy skills, practice your mask removal and rescue drills, and dive, dive, DIVE!!!!
If you're only doing blue water dives to 60 feet, you don't need a deep-water tech rig. Ditto for computers. You don't need a gas switching super gizmo. HOWEVER, if you think you'll be diving deeper, the odds are you will get Nitrox certified (it's only a class), and so you'll want to be sure to buy your original gear that can handle Nitrox.
On the BC's, buy what works for you, fits well, and is COMFORTABLE. No use getting a deal, if it fits poorly, has no accessories, isn't weight integrated, etc. Yes, they're expensive, but you can also get them used. The nice thing about any LDS, is they'll let you try them in the pool, or do a rental/purchase. Yes, the LDS does have to pay a light bill, and employees to help you, give you advice, etc., so they may not be as cheap as online. But when your online thing breaks, can you get a free loaner -right away - while your equipment is being fixed under warranty? Remember if you buy something new, you should make sure it has a manufacturer's warranty. I bought a wetsuit a couple years back, in an online sale. First trip out, the zipper broke. I sent it in and they fixed it - in 9 weeks.......
So, I wouldn't beat up the gear. If you're ever concerned you're being oversold something, talk to the LDS manager. I have never seen an oversell occur, in all the shops I've been in across the country.