Yes and because Sweden has national service, they have hundreds of thousands of men (and even women!) with military training available that wouldn't take long to mobilise. Let's also not forget that 20-30% of Russian forces are also conscripts.
Taking a position like Gotland would leave you completely open to anti ship missiles and air forces, Russian ships aren't the best at defending against anti ship missiles as we've seen in the Black Sea. You would then need to land and establish a beachhead, and keep those troops supplied, all whilst the air and sea are contested. The Russians could try and land airborne troops onto the island but if they're not supported quickly by sea (which would still need to pull off an amphibious landing, again very hard to do) they will be wiped out quickly. We saw at Hostomel how hopeless they were at this, essentially throwing away some of their best trained troops, which once gone, takes a very long time to rematerialise.
Considering Russia has exactly zero experience of actual amphibious operations, which require the highest degree of combined arms coordination, I can't see this plan going well for them. Especially as they've struggled to perform combined arms operations right on their own border in a land only conflict where they haven't had to utilise their naval assets, but still managed to lose their flagship. Even if they did manage to take the island at great cost, it would be continually contested and would be an absolutely insane place to try and put nuclear weapons, which could easily be lost at sea, or destroyed on land. So you'd essentially take Gotland for.......?