first of all I never ever perceived a revamp
it is true that at the beginning monsters were just easier to catch but I just checked again and it is still like the beginning so it is just as far as you get the harder it is to catch monsters with silver cards
I also think that it was never said that it is all about monster level to higher the capture rate of a monster (I know back when in saintspring there were level 150 monsters you couldn't catch those with level 60's or so because it said that your monster level is too low but it never said that the capture rate will rise from having a 130 monster or a 140 monster, just that your level is too low. I know one could interpret it as if your monster level would be an issue to the chances of captureing a monster but there are no informations given about it yet so you can't confirm it yourself) btw. what's your tamer level ?
second, by now you should have plenty of silver (I have like 33k left after I spend 60k when there was an event for silver eggs in the black market) so spending many cards wouldn't even be that much of a pain since a silver card only costs 250 silver (which means having 25k would allow you to buy 100 silver cards)
last, when you get every monster you want just too fast, there would be no fun at all like building up your own team would be much more meaningful since you really put in efforts in it, sure for some player who just wanna have a strong team but don't have the patience to build up a good team this game isn't that much of a good choice also most of the monsters aren't even rare, except for cherubi and hatchlings I can't remember a monster which let me struggle of giving up on them, when I build up my team for the tournaments I wanted at least one full set of archangels in my team, I had one at that time and afterwards after many fails of even catching a cherubi I was done with having 3 cherubies which I leveled up hich enough but also when I finished the tournament I ended up having like 5 arch angels since you get so many eggs during the tournament also I got 5 of all the evolutions of bon/ 4 of wendigo/9 of deathcrawler/4 of goemon and 4 of snowman. I count those monsters since they are said to be "rare" in some places in this game but still I got them easily without any trouble the hatchlings could be considered a real challenge since they are really really really hard to get - rarely in 4 specific spots or golden eggs, (actually I don't even have all quests done from the old sage only because of those left hatchlings) but thinking of all those golden eggs you get while playing (overlords/quests/free eggs from the black market/tournament) it should be arround 10~20 eggs (atleast I had the feeling that it was that much =D) but adding the fact that you get golden eggs from the infinite dungeon (floor 110 going straight up every 10th floor beating fafnir) it is just too lame to say that it is hard to get any monster from this game
taking it into consideration that you are talking about silver cards just tells me that it is some kind of monster you wanna catch in the wild region (not a hatchling or so since those are so rare that nobody in the world would catch them with a silver card, also while you play you get so many golden cards that you should even have many gold cards left to catch rare monsters like hatchlings etc.)
also catching itself isn't the hardest part - when you try to build up your team you surely need to level up which isn't the easiest part (or if it's easy i'll just say that I'm too lazy :P) plus all the soul stones you should make by leveling up iron sludges to level 150 and turn them into soul stones is the real badass part