Starting a startup is a lot easier when you're (relatively) financially secure. There's no way I would have been able to survive the first 6 months of my startup (when I didn't have any revenue coming in) if I hadn't saved up a decent amount of cash from working elsewhere (not to mention that working for others gives you important skills). The important bit is to think about this systematically: if you're going to take a job to accumulate financial and human capital, have a plan for how long you'll work there and how much capital you need to accumulate.
Being able to found a startup on your own terms (without having to desperately find angels) is very freeing and I definitely prefer it this way. My current startup is doing much better than my last one because this time I'm not worrying about investors at all.
How much do you think is a 'good' amount to have saved up? I have a little over 6 months saved up but all the articles I read are like "You need 18 - 24 months. Minimum." which I think is complete BS, especially for a tech founder with an MVP (this isn't to say non-tech can't do it, it was more that tech people can find freelance work)
Note that you can spend $8k/month or you can spend $2k/month, depending on where and how you want to live while you're founding your startup. The nominal dollar amount could be a huge range.
You could also reduce the dollar amount of savings you need by the revenue in your MVP - if you're making $1k/month on a software startup you'll probably be able to net that against your monthly spend, even if most of that $1k/month is currently going towards fixed costs. The difference between an MVP that generates revenue and one that does not is enormous.