Master Changes in Path of Exile: Blight

I hope some staff member reads this:

I've heard from some people who put 1k hours into Legion, and still hadn't unlocked all crafting bench mods.

That is an insane amount of effort, and still no fully unlocked bench.
That really needs to change, or people will burn out.

I recently put someone on my friends list, who said he burned out in Legion, and would play standard for the future, even though Legion was his first league.

If there was an unlock with each unveil, that would go a long way towards reducing the risk of people burning out.

Making it require several unveils for each tier seems to be what makes it far too much of a grind.

I have a question. I am sorry if someone already asked and got an answer, I didn't find it.
What if I don't like to run Alva's mission (just for example) and stack them on Atlas for later? Is there any limitation on each masters accumulation on Atlas? 100? 1000? No maximum at all?