Yes! That's exactly true. I have a very real experience on this. I got introduced to Anthropic's family of models with Claude3.5. I fell in love with the specific personality of Sonnet, the model. I can't remember if back then Opus wasn't public yet but I remember very clearly trying out Opus several times when it became touted as best-in-class and actually recoiling from the foreign feel of the Opus model. I remember very well that my problem was that it was way too eager and pretty hard to steer. I returned to Sonnet and I've used ONLY Sonnet ever since. I have/had access to Fable and Opus4.8 but I never once tried them. In the early days with Sonnet3/4.5, I bought ChatGPT, I also remember thinking that it was a great teacher but a lazy coder. You'd get the scaffolding and then '# rest of code block' not full implementation so unless you wanted to learn the concept, weigh trade-offs, ask clarifying questions or jump into a rabbit hole... You had to go code it yourself. ChatGPT generally as a model is a very good teacher so much so that the free version is enough and I use the free in combination with the most advanced Sonnet model for actual SWE day to day. And whenever there's an Opus release I'm actually very excited because it means there's a smarter Sonnet model OTW. I'll actually be veryyy very sad if the Sonnet line gets sunset. There has been no Sonnet upgrades since even as other family lines get improved.

Do note that I only use LLMs in the ChatUI, I never use agents. I don't believe having a blackbox codebase managed by entities with a half-life of 'delete conversation' or 200k tokens is a responsible idea. In ChatUI, I lay the ground rules, kill assumptions about our working relationship, give it foundational context on the problem and codebase we're working on, explain the problem and then we have a conversation about it and I gradually disclose more logically context as it becomes relevant. So, to directly answer your question, maybe I'm missing out on a ton of upside by not using the absolute best but I'd say familiarizing yourself with a specific model has all the benefits of having a human friend you've grown up with... except your buddy's a savant and would absolutely love to help!