The chips in the Intel i5-1135G7 and i7-1165G7 and the AMD 5500U and 5700U can run Sims 4 on at least medium-high or high settings, depending on playstyle and player preference. The chip is integrated into the processor, so the important question is what CPU the laptop has. The next tier down in terms of both price and performance is a high-end integrated graphics chip. If it's in your budget, I'd go for at least a 3050 rather than a 1650 just to futureproof a bit, but even a 1650 should always be able to run the game on a mix of high and ultra settings. So that means any card with a model number 16xx, 20xx, or 30xx from Nvidia, or 5xxx or 6xxx from AMD.

Without any idea of what your budget is, I'll say that any reasonably new graphics card that doesn't start with MX can run Sims 4 on ultra graphics settings. It does sound like you might benefit from higher-end hardware than what your Mac currently has, especially if it has an Intel chip as opposed to the newer ARM (M1/M2) options. But if you want one for performance reasons, then sure, I can help. So I wouldn't say that the disappering content is in itself a reason to get a new computer. (It's also a problem in Windows.) It has nothing to do with how well your computer runs the game, although it does tend to happen when a computer is low on free storage.

The missing content is a known issue, or rather a side effect of iCloud in macOS.

Cc for sims 4 pc