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It is quite a coincidence that you are asking just now. My brother's place has just recently finished the remediation work, and I helped him moved the final bits of furniture back down into the basement this past weekend.
After a LOT of asking around, they found a plumbing company that was willing to look into the work, and it turned out to be a *really* big mess. Their bungalow is ~60 yrs old, but we don't really know whether any renovations have been done to the any of the foundation concrete or drain pipes. As it turned out, however, the old drain pipes were all brittle and cracked, so there was definitely water seepage coming into the basement through that during heavy rain. On top, they found a crack in the foundation (on the outside, I believe) near where the drain pipe was, and they suspect that was likely allowing water to come into the basement as well.
As both a remedial and preventative measure, the plumbing company dug a trench all around my brother's bungalow, replaced the drain pipes, re-applied water sealing all around the foundation concrete, and covered everything up again. It was hugely expensive and took a long time because a lot of the work could only be done during good weather.
Based on what you said in #1, the fix that my brother had to do is likely the same "proper fix" that you mentioned. If your inside seal is working well enough, I would (naively) just leave it at that. Or potentially, if you are concerned, I wonder how viable it is to just dig up that side of the house a bit, and only re-seal the foundation around the vicinity of where the crack is found?
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