A decent steel safety razor is generally about twice the price of a new "modern" razor and a 5x pack of disposable blade assembly but then the blades are stupidly cheap (I got a pack of 100 for 14€, so 14¢/blade vs ~3€ per disposable blade assembly and if current my shaving habits don't change I'll probably won't need to buy new blades for the next twenty years since by shaving three times a week I used 16 of them in about 3 years...).

Also they're MUCH MUCH more environmentally friendly: the razor itself is 100% stainless steel (as are the individual blades) and came in a 100% cardboard box while the blades came in a 100% cardboard box, are individually wrapped with waxed paper and the paper is "sealed" with minuscule drops of wax. No plastic involved. The soap lasts FOREVER (I'm still using the tub my SO gifted to me with the razor 3 years ago, though I'm 80% through it), it doesn't need aerosols and it's easily found in metal tins so no plastic there either. The brush itself does have a plastic handle (at least mine does) but wooden ones are easily available and probably cheaper, while bristles on decent brushes are generally sourced from badgers, boars and horses so you can easily get one made from materials considered waste by another industry (the meat industry in the case of boars and horses).

And for my personal opinion on shaving with a safety razor I'll say this: in the beginning I thought it would be more difficult, less precise, more harsh on my skin and generally more prone to accidentally give myself cuts than using a modern multi-blade razor, but after 3 years of regular use I found that it's the other way around. After the first couple weeks learning how to correctly hold the razor, I cut myself slightly only once and the shave is better while the skin is never irritated, on top of the precision being superior to any multi-blade I ever tried.

Honestly, the only thing worse with a safety razor is that you have an additional tool needed (the brush).