I think it was less about Sameer and more about Mundit.
I feel the reason why they didn't compare with Lakshman but with Hanuman was because it was Hanuman ji who found Sita Ma. Without Him Ramji couldbco have got Sita Ma. Lakshman ji although important but was not so much important as per the Ramayana perspective (just my view) when compared to Hanuman ji. If we talk about today's scenario then Hanuman ji was the second lead while Lakshman ji was a supporting character.
I mean you could see that we worship Hanuman ji but not Lakshman ji. So I feel it's about giving more importance to Mundit.
P.S. Hanuman ji was a self made sevak of Ramji. Ramji never considered him as someone below him but always a friend. (The famous line from Hanuman Chalisa Tum mam priya Bharat Sam Bhai) Hanuman ji was the son of a king and friend of the king of Kishkindha a kingdom where even Ravan couldn't dare attack. So he was all powerful and equal to Ramji in power and stature (even in divinity as if Ram ji was an incarnation of Vishnu then Hanuman was a Rudra of Shiv) it's just that he decided to become a sewak of Ram. This only makes you all the more great if you ask me