That depends on how the court is packed, and how it functions after. It's possible that court packing could be seen as a success, even if each side alternates at packing, just because having many justices can minimize some of the court's current limitations.

https://time.com/5338689/supreme-court-packing/

To put it another way, the size of the House, Senate, and Presidency are determined by the constitution. The Judiciary is the only branch where it's size can be increased without a constitutional amendment, which could favor populism, regardless of who is in power, if it's expanded significantly.

Being as small as it is could speak to how the government has a tendency to concentrate/centralize power, even if it's relatively easy to spread that power out.

You are incorrect on one thing. The size of the House is not determined by constitution. The only things it guarantees are that there’s a census and that each state gets at least one.

It also demands that apportionment of representatives be according to the population of the states.

So, yes, the total number isn't fixed but the apportionment is.

if I recall correctly the specific rules for apportionment aren’t part of the constitution either are they?

Thank you for the correction.

I look forward to the day when SCOTUS has hundreds of justices...