They are restricted because they are [Event] pets, same for the Lucky Pig Mount and the exact same for DingDong, Tutti, Lady and Co. I guess all easy farmable [event] pets share this restriction. Don't forget they are free to get, you only need to farm some easy to get stuff to get your hand on them.
You do not need to invest a single cent to be able to randomize any of them. Just a bit of farming and some silver coins. Just talk to our good friend Harvey. So you end up with a free farmable mount and some free farmable pet randomizers that you can use to randomize your mount as long as you need to get your preferred stats. Of course you are free to invest some IM points and help the server live on in the case you want to reach your preferred stats a bit faster.
In all your complaints you seem to forget some facts:
- both "new" mounts are recolored versions of already existing mounts in the game (Feilon and Dark Flip) and like Poppie already stated both do come with their original skills and abilities just with a bit better stats (and additional ms stat)
- both "new" mounts are completely free for you to farm without spending one point of IM
- both "new" mounts can be randomized by just using silver coins as long as you wish, or ingame gold if you buy them from others without the need to spend 1 single point of IM yourself
- nobody forces you to farm and or use any of them if you don't like them
Regarding getting health and ms at once you just seem to be a bit unlucky. I had 5 different ms and health combination on my personal event mount so far, yes I used both normal pet randomizers I bought in the market and event randomizers. Right now my mount is the proud owner of 10% ms and 20 health. Since I'm used to running around with a normal Dark Flip (1% ms and and +3 Health) this for me already is a jackpot for that mount and I could not be happier right now. Plus the fact I did not need to run Akia Cave 30+ times to finally drop the wanted Dark Flip egg to get one of them makes me personally really happy. The two new mounts are really easy to get for everyone that is interested in them, just pick any map you like and farm and done. If you farm a bit longer you slay two birds with one stone and get some additional silver coins for some free event randomizers too.
I personally really appreciate the possibilty to get a mount with some good amount of movement speed and in really nice colors for free. But in the case you don't appreciate this or just don't like any of the two free mounts just don't get any of the mounts for yourself.