I too am seeing a lot of confusion with some of the manufacturers' stuff. Whelen in particular has SO many variants of lightbars that I simply can't keep up. Maybe I'm just more used to FedSig stuff...
The barrier to entry for new companies in this market is pretty high these days. Feniex is doing a good job of taking products that are sleepy and outdated (Vertex) and upgrading them to something up-to-date (Cannon).
Part of the problem is that W and FS look at what each other is doing and try to adapt their products based on what their competitor is doing. It's hard NOT to do that, but it also limits their creativity in new products. FS has the Valor, which W can't do because of patents, so W brings out all their other perimeter lights with a "V" shape. Same with the mechanical siren tone. I'm sure some Whelen products have had significant influences in new FS products, too.
I almost hope that they STOP watching one another and just make the best product they can. Then, they can come up with innovative products never-before seen in the market, like the Vision bar as an example.
I've been in this business full-time for 15 years now. I can't recall the last time someone asked me how many flash patterns a product does. It's just not a concern outside of the lighting geeks (yes, I'm one of those), but most customers don't care. What they DO want is good local representation, reliability, and fair (not necessarily the lowest) pricing, along with good support. A good assortment of mounting brackets is also important (Whelen does an excellent job at this, FS not so much though they're starting to catch up).
Like John, I see a lot of Fire Dept's spec "Whelen" or "Federal Signal" on their truck bids. When we ask them why they do that, almost always the answer is "because all our other stuff is that brand" and they want a single-source of spare parts, a uniform/consistent look to all their vehicles , etc. Many times you can show them a better product (in a different brand) for about the same price and they won't care. The need for consistent appearance across their fleet and ease of service / single point of contact for parts, overrides the argument for a better product.
Unlike some of the comments above, we don't often see the departments buy based solely on cost. Often it's on trust (of the product and vendor) and features, and the ability to get good local service, though overall package price is always a factor. If I'm spec'ing FedSig and I'm 10% higher than a company half way across the country who is spec'ing an offshore never-heard-of brand, I would say 90% of the customers would go with us. If we were 2x the price, probably not...
Some of the lightbar features like dual colour/tri-colour and the ability to do full front flood are sincerely helpful for many agencies. We just couldn't do that before 2012 or so, and now that we can, it's one of those "how did I ever work without this" kind of moments for many agencies. However, not all upgrades are worthwhile - sometimes they are done because the manufacturer can, not because they should. Engineers and marketing people need to remember to talk to the customers!
To answer the original question; yes, I think some manufacturers have gotten carried away with too many lightbar platforms. The customers don't care. You need a few different models for fire apparatus, police cars, and the like, but not 20.