Also, armor is completely different in the way it's handled. MT, an armor of 40 was minimum for a ship, and armor of 120 was a cubic butt ton. The scale was not linear, it was somewhat logarithmic.
FFS armor is linear. AF 2000 is twice as good as AF 1000, and minimum armor is only 10 times the expected G rating of the ship, so most merchants have armor of 10, for their 1 G engines. Battle Rider stats for battleships indicate that they have an armor factor of several thousand (don't have my stuff handy), whereas in MT it would be 100, 110, or 120.
FFS requires more crew, because it was assumed that you would want to virus-proof your ships, and having more crew does that. And maybe they realized that real ships have excess crew to cover 24/7 operation (two shifts of 12 hours is typical), plus you need room for battle losses. And who's going to CLEAN the ship if you don't have enough people? Really, cleaning is the navy's #1 job. I can get hired as a maid anywhere, thanks to my navy experience.
FFS2 made the allowance that a designer could choose the level of automation, so a highly automated ship might need like 1/3 the crew.