[2] does make_seed(256) for a 24 words seed, is that as robust and safe as the defualt GUI 12 word at the begining gui for a new wallet
[3] could you use a make_seed(512) for a 48 word seed if you wanted? what are the risks
If you want to import the 24 or 48 word seed on different wallet software or library, it may not be supported or buggy even though they claim they support word seed created by Electrum. And while theoretically 24 words could be more secure than 12 words due to larger search space (2048^12 compared with 2048^24), there's almost no practical security benefit when brute-forcing 2048^12 search space is impossible.