I play guitar. I started out. Now, I kept both going together with keyboards, and the bedroom musician effect, with doing everything of my own (Mike Oldfield effect). Overdubs, dubs and layers. No one came around to my place to play. Now, I've since 10-15 years back made bass my primary instrument, and lo and behold, I've become much better at guitar as a fringe benefit effect. Knowing what not to play. Not being that PIA guitard. And the main thing is, that's as I grow older, a few things makes it more advantageous to be the bass player:
1. You get fatter fingers. Ask anyone married, what happens to their wedding ring...it is a little tighter isn't it? All guitar necks but classical guitar, are way too narrow for me by now.
2. You keep track of one note at a time basically.
3. Sight has gone to shite, so you don't have to watch razor sharp at 6 thin strings all of the time. 4 thick big long fat ones, I can see the difference between.
4. Hearing, I don't hear the top end anymore, losing any judgement on the treble control. Bass and low frequency will take time before it disappears.
5. Hassle. On guitar, I just had to plug into this or that, and MY pedalboard, and MY amp, and MY gear, lots of cables. Had to use heavy tube amps, and no lightweight speakers.
6. On bass, I have ONE CABLE and a decent amp. Turn up, plug it in, turn it on, tune up and play. Very very ergonomic.
7. Yes I am getting more spolied, complacent, and wants to cruise just comfortable these days. Then bass is a perfect vehicle.
8. Some people - actually - have said that I am a better bassist than guitarist, for ages. On guitar, it's more angular, naff, than on bass. On bass, everything seems to flow more effortlessly without me woodshedding or honing anything specific.
9. Headless basses takes up as much space as a regular headstocked guitar. Suits me just fine. No, I don't use 6 string basses to compensate my shortcomings...

10. The main thing, culprit, was that when hearing regionally and locally bands that played covers and jammed, I thought when hearing the other bassists "oh well, but the tune doesn't go like that" even more so than the other instruments playing.
11. When I play with some unknown, they say that it's preferable to have the bassist actually know a tune by heart, and keep it down, and in the pocket, that one that plays flamboyantly and wants to show off and impress all of the time and knowing any tune. I e being virtuosic. Leave that to the gtrds who can cruise on top and even "sit out the middle eight" which they've never learned anyway.
12. Which make bass a way more social instrument than guitar. You can sit alone and w*nk away on you guitar in your bedroom, but bass needs a band to be played in. Drums, gtr, keys, all the rest. Must get out and play with someone. This is just as important.