Yes, you quoted that Tier 10s are comfortable to play. This isn't in dispute.
Specifically, my ask was:
The way that folks were framing their arguements was the the economy is messed up, and Tier 11 Service Cost is how to fix it. That this is the correction for a mistake.
I called that into doubt because whether you have more Credits than you can spend or not isn't something that a higher Service Cost is going to re-balance or fix. There are other Tiers and experiences that exist which don't care about how many Credits someone has outside of the initial purchase of the ship and getting Upgrades on it.
Part of what you quoted...
... ends with "And this has had a significant effect on their popularity."
As a carryover from a different thread/topic, Random Matchmaker is a way to provide a varied experience, which prolongs the life/interactions within the game. Another thread spoke about ships that were removed because they were "too popular", which leads to match stagnation as the same ships are seen over and over.
If Tier 10 is comfortable to play, and people gravitate to the biggest, bestest thing... then it's reasonable to expect most players to play Tier 10 most of the time.
This is anthetical to a varied experience across many tiers by reducing the actual experience to one tier, or one tier's matchmaking spread.
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While old Tier 10 had Consumable Costs and other such mitigation factors, those have lessened over time and made Tier 10 something which is comfortable to play without deviation. Bringing a Tier 11 with "uncomfortable" cost association won't be a roadblock as you could simply out-earn the Service Cost during the play of the ship. However, it does inspire dropping to other Tiers if you want to earn credits to purchase new ships or flags or whatever.
In short, having a new Tier which has a less comfortable amount of Service Cost doesn't make ships unplayable except to those with mountains of money or an endless credit card. It incentivizes varied play across more than one tier by introducing a less "comfortable" system to repeat ad nauseum.