The little old LBS that we refer back to starry-eyed, is near enough a thing of the past and was not always perfect in it's time. However, today's business model is about marketing aspirational added value, branding, catering for a cash rich time poor clientele and also catering for those who see cycling as more of a fashion trend.
So there's a combination of big national chain LBSs, on-trend boutiques, plus some independent LBSs. The big chains and some LBS are geared up to sales and signing the cash rich time poor people up to schemes, payment plans and maintenance plans – they don't really cater for us strange folk who know what obscure bike bits we're looking for and know how to tinker. A lot of places don't hold much parts stock either, so it's best finding your bits online, etc.
The boutiques are for cash rich hipsters to hang out in with a coffee from the mini bar and aspire to the glamour of it all. There's two places near me in London N21:
One is Le Peleton which caters for 'Mamils', selling high end road machines and clobber, plus a mini coffee bar and screen for the watching Le Tour. I once went in to enquire about wheel building and with every technical question the owner kept having to refer to the wrench monkey in the back room. After letting me look through a catalogue, the owner suddenly turned paranoid and snatched the catalogue away from me and rudely accused me of taking notes so that I could spend money elsewhere.
Then there's Bike Boutique, which was forced to downsize to less expensive property quite soon after opening. It started as an odd mix of fashion boutique and bike shop, selling Coopers, limited parts/accessories and cross over urban fashion clobber. Now it has even less expensive fashion stock for sale and just seems to cater for weekend 'Mamils' with a coffee and cake seating area, plus a minimal workshop in the back. After popping my nose in, I wouldn't trust it with a spanner. Plus it has an electric bike in the window...
With the big chains, there are some store locations where genuinely helpful bike enthusiasts and mechanics do work. It's not all bad and it's good that more people are getting into cycling. There's room for all of us.