The game would be better and make TC system more sense without this restriction:
I really like the new content. But that restriction is bad for these pilots like me, who have waited TC years and years to finally enjoy it in parts... Why I will buy another 2 TC ships or buy skills for my parsecs / ravens ships? if after this I can't be able to land in Sirius like another systems. (1.5M of cryonite for TC ships, 5 - 6 millions for parsec / raven with Venar tech and ancient armor. It's a lot of time for each one, and a biggest lot of time if we buy for sirius/TC around 5 parsecs / ravens)
Please, that restriction makes TC like it was before the update. Sirius is easy for one player with memberships & gravitons but it still being tedious. And we have since 2012 with Sirius as the higher place in the game. If you remove that restriction Sirius will be less tedious and we will have another way to enjoy the game.
Why TC looks like before with that restriction? Because when you need to go to Sirius, the ancient sirius tech still is the highest tech can land here. And TC is only Venar, it isn't a complete system for reasons we already know. So, you will complete or not the story missions (because after that, we don't have another planet to explore at now). You can get some BPs that you need while you up the three new levels. And another thing you can do will be white missions. Else, you return to sirius. But, you return to the singularity like the progress made in TC wasn't worth.
I know it is a singularity and not a regular system. But that doesn't matter for apply that restriction. We spend a lot of time and money to buy these ships.
Like another user said "We are pirates, we don't follow restrictions". Or like I said "We have years and years in Sirius with the ancient tech as the highest tech in the game. It's time to evolute our guns".
I hope you can understand it, Highway, and finally proceed to remove the restriction