All the advice above was absolutely on-point. I’m not sure I am going to add anything beneficial for your questions, but I’ll try:
Yes? Everything will eventually reach a point of diminishing returns. There’s analogies all over life. Think about working, for example. At first, you start with 10 hours a week. As you double and quadruple your hours, your gains (income) scales linearly). Then you start working overtime! Even awesomer, because now every hour nets you 1.5x the return. But then you’re so tired you fall asleep on the clock and get fired, it backfired. Next time you go for a salaried role, so you don’t fall into that trap (this is our new progression model). Working more keeps getting you promotions and it’s awesome. Eventually, though, you’re near the top of the organization and the promotions just aren’t there - working more is just going to grind you down and not make a quick difference.
That took on a life of its own (but, hey, I had fun), but let’s see how this applies to our examples:
Absolutely, but there’s a point where this is no longer practical. Are you going to take rest intervals such that you’re in the gym 8 hours for a session? Even physiologically speaking, your breaks can get so long that you’ll now need a new warmup for the next set. Similarly with frequent deloads/ infrequent sessions: if that’s your go-to, you eventually run into a point where you’re actually detraining between sessions, because they’re so far apart, so you can’t progress.
For sure - the slower you add weight, the longer you can do so. Without debating the merits (I’d rather just take what’s on the table, but whatever), there is no ability to add forever. You one day reach a point where even the heavier collar is just too much. What’s more, striving for the increase will take a toll on your joints and nervous system… that brings you back to point 1 above, where you find yourself out of the gym more than in it.
This is probably the best choice, but really because you listed both options - increase quality or quantity. I think we almost played through a funnel to arrive at “both,” which is just how it goes. To boil all this down to the cliche, which is a cliche for a reason: everything works, nothing works forever.
Whatever keeps you more interested, and then do the other one. As we’ve seen in our examples above, we’re going to have to change something at some point anyway. This is actually a good thing, because no decision is a life sentence. Pick what feels fun right now, then ride it until you hate it/ haven’t made any improvements for many moons and try something new.