Homeworld is so good I’ve purchased it 3 times over the years on separate platforms.
Can’t speak to any of the issues of playing the HW1 campaign on the HW2/remastered engine. It’s been so long since I’ve beaten the campaign that I can’t remember if it was on the original engine or remastered (that’s the great thing about old video games, you always remember them looking so much better than they do haha!)